Video and audio content on your website must have text alternatives to ensure that it is fully accessible to all visitors, including:
Alternatives to text for all non-text content include posting a transcript for or adding captions to any video you make publicly available.
New York State policy mandates that all web-based information and applications meet accessibility requirements in compliance with Federal Section 508 of the Rehabilitation Act of 1973.
The Commission of Deaf, DeafBlind, and Hard of Hearing Minnesotans also has produced an excellent, free online course on video captioning. It details the relevant legal standards and public-outreach considerations, explores available tools and gives you the knowledge to use them efficiently.