[Closed] Anyone have a surveilance camera?

Twice in the last month we have had the cars vandalised. The first was a scrote dragging a key accross the bonnet of my wifes car and today i wake up to find snow paint sprayed all over the car which has bubbled the paint and made a right mess.

The cars are on the drive and the police have been round, and they suggested a camera as its fine to use on your own property but i wondered if anyone has one for this purpose and can recommend one.

I was thinking something with a sensor that triggers it to start recording?

Any suggestions