The chrome trim is held in place by the light clusters plus trim clips. You have to remove the trim panel inside the door, you then have access to the nuts that hold the lights on, once they are off the chrome trim is easy to get off. The original reversing camera is 6volt so you will need to get a converter unit, available on eBay, plus you will have to locate the correct wire at the head unit loom to trigger it. When I fitted my Pioneer AVEC unit, I found the easiest way was to fit a wifi transmitter unit in the tailgate connected to a new 12v camera, both powered from the reversing lights, then the wifi receiver unit in the centre console below the head unit. e.g. wifi transmitter/receiver unit https://www.ebay.co.uk/itm/187285465898