Analog Into IP: Future Proof Cabling

We are installing analog cameras but as the owner wants to "future proof" the cable when he changes his mind into IP camera so we use CAT6 cables and adding passive video baluns to incorporate the analog cameras.
There are some things we still unsure off though:
1. Will the analog signal from the camera clear and strong enough using CAT6 and length of cable is around 120 meters, using passive video baluns at both camera and DVR ends?
2. When using CAT5 cable + passive video balun (cable length about 50 meters), I found the video signal is too weak so I had to combined 4 wires (solid ones together for the + of video) then it works.
Under this exact same cable when adding 12 volts power into the CAT5 the video signal is gone. What's going on that I did wrong?
3. Can the DC power also put into the CAT6 while the video will be transmitted along within the same CAT6 cable?
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