I have thought about videos. Given the text material tends to live quite a bit still, it would add to maintenance overhead. So most likely I won't be doing videos anytime soon, at least on a larger scale.
It could be worthwhile to experiment with individual videos and dig into specific topics to get experience and feedback. As I'm not a native speaker, it's not going to be as easy as I would like. But just like with books, you have to start from somewhere.
That said, I have certain short term plans that build on top of the material. There is still a lot of work to do and the concept can only get better. Videos are definitely a part of a longer term vision.