i had an old Swann camera system in place and switching these over to Wyse cameras. I already have Siamese cables run to each of my old cameras. A Siamese cable is a cable that has BNC connector for the picture and small male plug to power the camera on both ends. On the DVR end of the run, the BNC goes to the DVR and the plug hooks to an adapter outputting DC 12V 5.0A. I believe these cables are 18 awg with just +/- wires running through the power portion.
My thought is just to cut the plug on the camera end of the run and splice a micro USB onto the end of the already in place power cable. Some of my runs are pretty long but I never had a problem with getting power to my existing cameras. This would save me a bunch of time fishing wires if it worked. What are my odds of success?