You can add the factory ParkView from a Commander or Grand Cherokee, however it requires a dealer to activate it with their StarSacn tool. I looked into, but the camera and activation started approaching the prices I was able to get a Lockpick and backup camera off of eBay for. That way it didn't require a dealer visit, and it unlocked all the stuff on my Nav unit as well. I ended up at about $225 for the Lockpick V5 and camera.
2013 JKU Sahara, Gecko Green, loaded up
AEV 2.5XT lift, 315/70/17 Duratracs, AEV Pintler wheels, front/rear bumpers and hood, Warn 9.5cti-s, Teraflex carrier/hinge, Yukon 4.56 gears