I can't create two dvds and put them into two dvd players and click play at the same time as the movies are synced to live music, not pre-recorded.
Why not? Whether one or two movies, the video can't adjust itself, therefore the live performers must watch and stay synched. Since they have to watch at least one movie and stay synched with it, why can't you practice a bit and find the point where you can pause each DVD player and press "Play" at exactly the same moment.
It's low-tech, but I don't see any reason it can't work.