Sure! This library is best suited to "vector" content: text/graphics/animation, rather than a video of real life (although you could include a traditional video in a ractive if you wanted). I just left a comment at the top that explains my own use case and links to a bunch of examples of using it to teach math/programming.

Some other examples I can think of: If you were making an informational video, you could put D3.js into the video so your viewers could interact/experiment with the data. More creatively, you could make a video where viewers make choices that affect what happens next. Or you could make it so that when they rewind the video, it plays something slightly different than what it did originally, simulating a narrator's unreliable memories. (I haven't tried either of these, but I think they should be possible)