Looking for some info on CCTV

Basically
I need to know if you have a standard cctv that utilises cat 5 cable and video and power baluns on the camera and DVR end to connect everything

If you changed to 8 mp HD camera and nvr that uses rj45 ethernet plugs

Could you buy passive rj45 to bnc adapter instead of cutting the cat 5 cable either end and crimping a ethernet plug to plug into the nvr and the actual camera

Basically plug and play to upgrade the system

As opposed to cutting and crimping the cat 5 that already exists


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