You are going to have to be careful of two things. First you are going to need a video 2 input one output box not just a simple switch. Second you are going to have to find a camera that is capable of being installed in the fron, because most reverse the video and even if you flip it and hit the revers button on your unit it is not going to look right.
I had a guy with a audio want this done and it ended up not working because simply the camera was not made for front facing.
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