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Remove the driver's side A-pillar molding. (Remove screw cover, remove screw, and pull the molding away from the vehicle.)
Inside you will find some wires. All vehicles will have the Dark Blue/White wire that is the feed for the rearview mirror (auto dimming/temp). This wire is hot in ignition ON and Start.

If you have a sunroof, you will also have a yellow wire, that is supplies power to the motor, and is on the retained accessory power (RAP) circuit. (This circuit keeps your radio powered with ignition off, until you open the door.)

If you are looking for a backup signal to allow the camera to come on only in reverse, look for a brown wire, that will have voltage only with the gearshift in Reverse.

As always, when tapping into these wires, make sure you test everything with a voltmeter since there could be other wires running in the same area that are of the same wire colors.