Web Content Accessibility Guidelines (WCAG) is the standard under the American Disabilities Act. The level AAA clause 1.2.6 states every speech or video must have sign language alternatives. It is not possible for live or video classes or even for prerecorded youtube videos is there a way around it?Is the WCAG level AAA binding by law and requires all video uploaders to provide caption and signs?
WCAG is a standard, not a law. It is one way of providing the accommodations required under the Americans with Disabilities Act, but not the only way.
Additionally, the ADA only requires reasonable accommodations, not "any accommodation that anyone can think of". In my experience, compliance with WCAG at the "AA" level is usually considered sufficient to be "reasonable".