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Most browsers support embedded videos now, which have the advantage that you can rewind and pause. You could also provide a transcript or static screenshots.

The unfortunate thing is that GitHub flavoured markdown doesn't yet support webm or other types of video embed.

If you use github pages you can use the HTML5 video tag, here's an example from my account's Github pages

https://icpmacdo.github.io/

https://github.com/icpmacdo/icpmacdo.github.io

Github pages renders html so by default it supports video, However It's totally different case with markdown files.

Though it's not embeddable, tools like asciinema [0] are great for this, too.

[0] https://asciinema.org/

Now it is too slow and I got bored waiting ;-)

Use the fast-forward button, that is available on any decent video viewer. Oh wait.