You would have to purchase a radio interface such as a lockpick, NavTv, or a PAC. There are other brands but those are the well know ones. They plug in between the radio and the factory radio harness and offer forced camera options, video in motion, navigation address input while in motion, among some other things.
I've read some articles about this and found some tutorials on Youtube and these are the requirements to be met.
– IGN Status:ON
– Engine Status:ON
– Gearshift Status or N
– Rear view camera switch:ON
I've tried to use this using my Deejay LED rear camera that I bought here https://www.adorama.com/djtbhcg960.html and it worked sorry if I'm not using a stocked one because some thugs removed my stocked rear camera arggggghhhh.