Technical Reversing camera connection

[Rohsman]

Hi I need some help with reversing camera wiring. I want to turn on reversing camera when driving to check trailer. It operates off reverse gear so hoping to jump connection in back of radio to turn on with switch and hopefully not put reversing lights on.

Connection diagram on back of radio unclear. If there is a wiring diagram out there or advise from others that have done the same it would be great.

Thanks

Ian