Recruit parents? Use a tool that track viewership by student, send reports to parents, grade them on it? Block students from classroom if they haven't seen the

Recruit parents? Use a tool that track viewership by student, send reports to parents, grade them on it? Block students from classroom if they haven't seen the lecture, and let parent's know? There are traditional ways of motivating student, a combination of carrot and stick. But yeah its not been solved yet.