does any one know of package/ system for installing a motion security camera in the car - writing to DVR or the like.

The reason being over 2 years of stalking by a very unhappy individual, who about every 6 months takes to slashing and keying the car... I have and event camera but that is useless moments after the ignition is off -( although recently it was mighty handy in catching the guy we had always suspected stealing property as i happened to turn in to the drive..)

I know we are a small country at the bottom of the world - but this is getting ridiculous..( now i know why people buy from the net!)  i cant seem to find any system that allows one to connect a couple of black and white - day/night camera's to a dvr designed for security not event recording.... the only ones i have seen are clearly commercial and 1000's of bucks?

any clues .. or recommendations for online purchasing?
Cheers ag