* Alterations must be accessible. When alterations to primary function areas are made, an accessible path of travel to the altered area (and the bathrooms, telephones, and drinking fountains serving that area) must be provided to the extent that the added accessibility costs are not disproportionate to the overall cost of the alterations. Elevators are required as described above.
All website owners should offer their users information and user interfaces in an easily perceivable manner. Moreover, they must provide text alternatives for non-text content such as images, voice, and videos. They must also offer captions or text summaries for audio and video content. Being perceivable also requires that the content should be easy to identify programmatically. This includes ease of listening and reading that features good contrast and easy volume controls. 
Thanks for writing. While I’m not a lawyer I believe if your physical practice is ADA exempt your web presence, as an extension of that physical business would maintain the same exemption status. If you’d like to be absolutely certain I’d confer with an ADA lawyer (email us, questions at yokoco dot com if you need a referral) but I don’t believe you have reason to worry.
Title II prohibits disability discrimination by all public entities at the local level, e.g., school district, municipal, city, or county, and at state level. Public entities must comply with Title II regulations by the U.S. Department of Justice. These regulations cover access to all programs and services offered by the entity. Access includes physical access described in the ADA Standards for Accessible Design and programmatic access that might be obstructed by discriminatory policies or procedures of the entity.
The title III regulation was again revised on November 21, 2016, when Attorney General Loretta Lynch signed a final rule that further clarified a public accommodation’s obligation to provide appropriate auxiliary aids and services for people with disabilities.  The final rule provides that public accommodations that own, operate, or lease movie theaters are required to provide closed movie captioning and audio description whenever showing a digital movie that is produced, distributed, or otherwise made available with these features.  The final rule was published in the Federal Register on December 2, 2016, and took effect 45 days after publication, on January 17, 2017.
The ADA has been criticized on the grounds that it decreases the employment rate for people with disabilities[48] and raises the cost of doing business for employers, in large part due to the additional legal risks, which employers avoid by quietly avoiding hiring people with disabilities. Some researchers believe that the law has been ineffectual.[49] Between 1991 (after the enactment of the ADA) and 1995, the employment rate of men with disabilities dropped by 7.8% regardless of age, educational level, or type of disability, with the most affected being young, less-educated and mentally disabled men.[50] Despite the many criticisms, a causal link between the ADA and declining disabled employment over much of the 1990s has not been definitively identified.[51]
Once you have been hired and started work, your employer cannot require that you take a medical examination or ask questions about your disability unless they are related to your job and necessary for the conduct of your employer's business. Your employer may conduct voluntary medical examinations that are part of an employee health program, and may provide medical information required by State workers' compensation laws to the agencies that administer such laws.
For discussion’s sake – while I don’t know the specific nature of your videos, my guess is that they might be demonstrating various techniques or other content in which simply hearing the audio of the video wouldn’t deliver the full context of the content. If making that content accessible is something you’d want to do, you’d likely want to start with a written description of what takes place in the video. Beyond that, high contrast vector images or diagrams showcasing specific parts of the technique would certainly help.
Public Services including public transportation - Title II has two sections. One covers public agencies (local, county, state, etc., government and their units). That section generally requires the agencies to comply with regulations similar to Section 504 of the Rehabilitation Act. These rules cover access to all programs offered by the entity. Access includes physical access described in the Uniform Federal Accessibility Standards or the ADA Standards for Accessible Design and access that might be obstructed by discriminatory policies or procedures of the entity. The other section of Title II is specific to public transportation provided by public entities. It includes the National Railroad Passenger Corporation, along with all other commuter authorities. This section requires the provision of paratransit services by public entities.
With these guidelines laying the groundwork for how best to comply with ADA law in America, many organizations increasingly have more clarity around the standards required of them and how to best accommodate disabled users. The best course of action is to act on website accessibility NOW. You simply cannot afford to wait another day. Whether that is with small or large steps, all effort is worthwhile in protecting your company so you can truly focus on what you’re best at: conducting business and encouraging a myriad of users to access your content.
Two agencies within the U.S. Department of Labor enforce parts of the ADA. The Office of Federal Contract Compliance Programs (OFCCP) has coordinating authority under the employment-related provisions of the ADA. The Civil Rights Center (CRC) is responsible for enforcing Title II of the ADA as it applies to the labor- and workforce-related practices of state and local governments and other public entities. Visit the Laws & Regulations subtopic for specific information on these provisions.