I haven't done a backup camera install, so I have no prior knowledge. I'll try to find out more info tonight for you.
According to the schematic, there are two LT GRN wires (one larger than the other) that connect to the I/P Relay Block. Connecting a relay to either wire should work.
I'd suggest you use a voltmeter to be sure you have the correct circuit.
The other option would be to tap into the TRL B/U Fuse (10A) circuit in the Underhood Fuse Block.
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