It won't work. I've done it.

What happens is it's usually done by a lazy teacher who has no idea what they're even teaching. Most kids won't be motivated to learn and watch from the videos.

I consider myself studious. When I was in that class, I watched all the video lessons and whatnot at home. Even then, I had a poor understanding of the material, and obviously the teacher was of no help.

Although not much better, a lecture is better of the two. Hands on learning in the best, but not necessarily possible with certain subjects.