Technically, it might work but that's not the correct way to do it as you know.

It could possibly degrade the picture quality on both cameras for one thing.

Also, rigging it like you are talking about will come back and bite you in the rear if the customer decides to install IP cameras that require Power Over Ethernet (POE) in the future.

I would say run a new cable and be done with it. It may cost a little more in labor now but it could possibly save the customer more money in the future. :toast: