I too am an elementary physical educator and I have not tried this approach yet. I have shown video for 2-3 minutes at the start of class or at a station but i like the idea of doing it as homework. The classroom teachers add daily homework on their class sites so I could easily have the teacher include the a video as an assignment and provide the link. Students could even complete it during their free time in computer class which is the cycle day before physical education class.
Would you provide questions so you know the students watched it?