I have used my GoPro as a backup camera. It was connected to my phone via wifi. There was a noticeable delay between the GoPro and my phone. I would back up a little and then let the camera catch up. After a few months I installed a wireless backup camera. I power my camera from the 7 pin plug (connected to the reverse light pin) and the monitor is connected to one the upfitter switches in the cab. The camera only activates when the truck is in reverse.
2008 F350 V10, Auto, Crew Cab, XLT, Long Bed
2005 Rockwood 2104
2017 Yamaha XT250 Dual Sport Motorcycle