I've got a Pioneer NEX radio. I eventually had a backup camera installed by a audio shop. They installed the camera where the factory one attaches to the car. I think they wired it into the rear backup lights as the camera only activates when the car is in reverse. Image is not crystal clear, but it works for a backup camera. I think I was charged somewhere around $200 for parts and labor.
2011 CPB CRZ
Suspension work, intake, exhaust/2nd decat
2017 Black EcoBoost Mustang
Suspension work, Bolt-ons, BAMA tune