In the drill 57 you have an example of such video (with link), however as you mentioned there are difficult to find on Internet and sometimes are Copyright protected. I’m thinking of making for each drill a short video but this is a huge project to do.
Before this I’d like add more drills and also physical exercises dedicated to for muscles that are essential for TT player.
The diagrams are normally enough for a coach to run drill, but for others, I agree, it could be some challenge. You can always take video of your training session and make analyze of it. It will help to correct mistakes. But you should know (or have reference) how footwork should looks like.
If you make it, send to me. Also if you can find something interesting on YouTube pls. give me a link. I will post on ttdrills.com site.