Most people either connect the camera to the line operating the back up lights or the running lights.
If you plan to use it going down the road the running lights will provide power as long as you don't mind having them on. I do for safety anyway so it is a good choice for me.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6