I have a house that has two camera location prewires that run from the entry doors to a Home director can with th ePL-01 trim kit. My question is the pre-wire consists of only a single RG-6 cable. No cable for power. Now I know I've seen a couple of cameras that run video and power through a single coax but I was wondering if there was another way around that so I could get a better selection of cameras?