2012 CX-9 back up camera wiring help

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2012 CX-9 Touring
I'd like to install an aftermarket back up camera and any chance someone can help with this? Factory camera harness has four wires; red, yellows and two blacks. Aftermarket has a power line and yellow composite video cable. The yellow video cable has three wires in it; yellow, red and black.
 
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2009 Mazda CX-9 GT
Here is the schematic for a 2009 with Bose.
 

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  • Nav_Circ1-2.pdf
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  • Nav_Circ2-2.pdf
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2012 CX-9 Touring
Thank you it is Touring, no Nav but I do have Bose. The wire colors on my car are different than what is provided. Appreciate the help though. Tested all four wires on existing harness and not one shows power when car is put in reverse...uurrgh. Looks like my best option now is fabricate some type of new bracket for existing camera since it rusted away to nothing.
 
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