I don't have any good advice, other than to say I am sorry. I would also be majorly bummed if I did something like that.
I have told DH that if there were a fire that the exercise videos and stuffed animals would have to be saved. I once even showed him the weights I planned to throw through the window to break the window to throw my videos out to safety. Of course since DH is a firefighter he is more concerned with getting me out of the house than the videos. I guess his priorities are in the right place, well mostly.
I have heard of something to fix scratched videos. Hopefully someone will have used it to fix a video and will have real advice.