Hint: the "interactive" demos are scrollable by dragging the bottom. (Sadly, you don't have any access to the terminal window's scrollbar, so you can't just scroll to the end of the "video.")
I still think a non-animated transcript of a terminal session is better.
Maybe that my wording is off. This are not interactive demos, but more like demos of interactive use in console ... "animated interaction demos". These use asciinema, which is a nice tool and I think it's good to display interesting interactions compactly. But yes, for deeper look it moves too fast for one, so something what you describe could be better. I could have these animations for getting attention and then linking to transcripted, detailed document. Do you have any example of a good way of displaying such console session statically?
I still think a non-animated transcript of a terminal session is better.