I tried it when I was teaching Calculus...

Turns out, recording video lectures so that they are lively and watchable is hard.

The students loved the couple of videos I posted, but then I burned out making them - since doing that was in addition to actually being in class, grading, and working on my thesis.

So I went back to the more traditional (and ineffective setting) - one thing I regret about that semester.

However, looking back, I'd need an entire semester just to develop the materials. Of course, that was not an option.