How can I install a backup my camera to my Nexus 7?

Hello fellow Android fans.
I do apologize if I couldn't find the topic I'm looking for, but here's what I need:

I want to install nexus 7 on top of my car's existing navi screen, but backup camera is the only function I use on that screen. Is there a way to somehow convert RCA Video feed into usb-micro, and if there is an app that would detect signal from Camera and run an App to view the incoming feed?

Please reply with an appropriate link if this has been discussed before.

Thanks a lot

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