How can i install a car video security system?

that will not provide a solution to your problem, it will just entertain you and be a waste of money, An insurance policy is the best way to protect yourself. It's sad that you have this problem in your own residence. Either don't have items in your vehicle when it's parked where you live and can't prevent it or garage it. I leave my car unlocked with the keys in the ignition usually and have no problem.