Here are a few videos that my students made in my classes this year. I really like the level of engagement I get from the students when they're creating videos, not just in the actual recording of the video, but also in the preparation and planning for the video. Preparing a video is like preparing to teach something to someone else, and in order to teach something you have to really understand it yourself. This motivates students to ask questions and discuss their topics with each other in much greater depth than they would otherwise.
Here's a short video a student made to explain the "Pythagorean Theorem":
Here's a longer video a student made to explain the characteristics of the function y = ln(x):
Here's a video of some of my students actually making their videos: