Q:

Transmitting live video over long distances with ethernet?

I'm having trouble thinking of the best way to transmit live video using a pi zero w and a camera module through a wired ethernet connection of around 100ft. (model 3 could also be used) I want to overlay a couple sensor readouts like temperature and humidity onto the footage and some control using possibly rs485 or another protocol through ethernet would be great for changing camera angle using a servo with a joystick on the other end. (RS485 uses 2 wires)
HDMI to ethernet exists, however 
Is there a solution which does not use all 8 wires of the ethernet cable? 
Would there be a problem with interference between both signals? I am not sure how twisted pairs work with cancelling emf in an ethernet cable.
Ethernet cable is desirable for its cheap cost/ft!

A:

There are great HDMI-over-CAT6 cables.
Some use 2 cables and can go up to 300 feeet.
Others use two cables and go 100 Meters.
Then there are also single-cable adapters that actually go 300 feet over a single cable, supporting 1080p and audio.  
Here is the search I used:  HDMI to Ethernet converter single cable
So there's your answer.  They are quite available, and affordable.
Whatever your software can generate to the HDMI port can run a large-screen at the 100 Ft specified.

