This camera just operates as a viewing device when it is on. It does not have any mechanisms that would allow recording to take place. YOu can, however, purchase a rear view camera recorder system that has a DVR for recording what it sees. They are available from Amazon. if you want it to record while parked, it would have to be installed so it can be turned on while you are parked.
As the others have said this camera only is a live feed working if wired that way when your backup lights are on however you can wire the camera to stay on constantly, and I suppose you could look it up to some type of DVR but as Nick answered I think it would probably be cheaper to buy a unit already made up for it or even a dashboard camera or one of the newer rear mount cameras that record constantly both of them you can find on Amazon just type in the search box. Good luck