ADA compliance means making your place of business fully accessible to persons with disabilities. The Americans with Disabilities Act (ADA) was signed into law in 1990, but it only covered brick and mortar businesses. Meaning your place of business had to accommodate people with disabilities. Now that technology has advanced, this law applies to your web site as well.
Videos need to incorporate features that make them accessible to everyone. Provide audio descriptions of images (including changes in setting, gestures, and other details) to make videos accessible to people who are blind or have low vision. Provide text captions synchronized with the video images to make videos and audio tracks accessible to people who are deaf or hard of hearing.

While the influx of the dot.com world eliminated the need for brick-and-mortar locations for all stores (think eBay or Amazon), all of the above categories typically had a headquarters, if not multiple locations where one could visit and interact.  This would ensure a unique experience, often depending on the individual needs of the visitor. For instance, when visiting a municipal building or institute of learning, a variety of methods are available to get to higher floors (stairs, elevators, ramps and escalators).
People with disabilities are all around us. They live in every country and often experience life in a very different manner than those individuals who don’t have emotional, mental, or physical disabilities. In fact, 15 percent of the global population is classified as disabled. Of this 15 percent, an estimated 190 million people experience significant disabilities.¹
Yes, in time non-ADA compliant websites will be penalized in the search engines. It's already on their radar. But for now they are still negatively affected, just in an indirect way. Live traffic behavior (user experience) is now factored into Google's algorithm and is a ranking signal. Negative user interactions absolutely have negative affects on rankings.
In short, the ADA is meant to protect disabled individuals as they go about their daily lives. These regulations ensure that people with disabilities are not denied entry into the above places or denied services by a company due to their disability. It is important to note that these regulations are now applicable to services that are provided online or through other digital formats. For example, if a company accepts job applications online, then it must ensure that a person with a disability can also apply for the job online. In other words, it is illegal to have barriers on the website that would keep the disabled individual from successfully completing their application. Fortunately, the ADA guidelines help to remove barriers and ensure that the Internet remains a space that people of all backgrounds and disabilities can use.
...the full and equal enjoyment of the goods, services, facilities, or accommodations of any place of "public accommodation" by any person who owns, leases, or operates a place of public accommodation. Public accommodations include most places of lodging (such as inns and hotels), recreation, transportation, education, and dining, along with stores, care providers, and places of public displays.
Courts have essentially taken three positions when approached with this issue. Some courts take the position that the ADA applies to all commercial sites because the law was meant to protect disabled individuals from having a more difficult time than able-bodied individuals from doing business. That is why the website Scribd was unable to get a case summarily dismissed and ended up settling.
The ADA statute identifies who is a person with a disability, who has obligations under the ADA, general non-discrimination requirements and other basic obligations. It delegates fleshing out those obligations to federal agencies. The agencies issue regulations and design standards. The regulations have the details on the rights of people with disabilities and responsibilities of employers, state and local governments, transportation providers, businesses and non-profit organizations. The design standards specify how many entrances need to be accessible, how many toilet rooms and the design for those elements.  To know what the ADA requires, you need to read the law, regulations and design standards.  
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