There is a clear plastic substance called resin. I am wondering where you can but it and if it is air dry or somethig you bake. it can be used to in paper weights and stuff.
The kids in the video most likely aren't the problem. So they fight just like the big guys. The real problem is the conflict between the parents. It's always been the parents blaming the other side. I remember from my hockey days as a kid, my dad would listen to the other in-house parents talk, and on the way home, he would always describe them. The conflict came during our travel games, the parents would always have a go; meaning either light talk to intense talk or plain threats, with the parents from the other city. Nothing physical, just talk and threats. As a kid, I just wanted to be out on the ice playing hockey. You can learn somethings that schools can't or won't teach you.
It could be a dozen things. Nobody here can help you because we cannot see the car. Take it to someone who can inspect it for damage.
