Hi mate,
Yes it is possible to connect a reversing camera, only if you have the TV tuner built in, if you have the vogue spec then I'm 99% sure you will have the tuner, one easy way to tell is do you have TV, or television lised on the main menu on the screen? If you have an American spec range rover then you will proberley not have the tv tuner as these were never an option in the US. If you have the TV option then it's a case of modifying the multi plug that goes into the TV module and connect the camera to it. I have a list of the pin outs for the multi plug so if you want it let me know. As I understand it is then a case of wiring it into the the reversing lights so that when you put the car into reverse the camera display overrides what ever elese is on the screen. The more difficult bit it where and how to mount it to the vehicle, the more modern rangies have it mounted next to the rear window wiper under the bit of plastic that sticks out over the wiper blade, but I'm not 100% sure how you would route the wiring back to the computer compartment in the boot area.
Matt