Create YouTube videos on exercises of a University level course
As an alternative to basing your videos on someone else's work, I suggest writing your own exercises. Each exercise should bring out the issues you want to cover in the corresponding video.

If you write your own exercises, on your own time, you own the copyright, and can do what you want with them, including creating videos about solving them.

That would be superior from a learning point of view, because your users will be able to watch your video, learn from it, and then check their understanding by completing the coursework.