Caught on camera

If your neighbor damaged your car I would suggest reporting the damage to your insurance company and letting their claims adjuster do the investigating into who is responsible.  If the inverstigator finds that your neighbor caused the damage then the two insurance companies will fight it out over who must pay.  You could also report it to the local police to investigate.  Letting someone else do the sleuthing might save you a lot of time and trouble.  If you take things into your own hands and do it wrong you might give yourself unexpected problems and unnecessary costs.  If the damage is minimal you might just ask the neighbor if he or she saw anything that might help.  You can just pretend you don't know it was them and see if they admit it.  This could lead to a better relationship with the neighbor than accusing them.