You can usually find reveiws for NUCs that will cover things like its power consumption. Looks like most fall in the ballpark of 5-10W idle. To 70-90W full load.
Each model may use a different voltage and you will have to look it up once you have narrowed down what one you want. However based on the wattage I would expect similar to a laptop power brick meaning you can lilely use a laptop dc-dc power brick to run it off 12V like the rest of your gear
Before all this. You can try a powered usbC hub. The cameras to your USBA ports. And the polemaster and mount should be happy sharing a usb3.0 pipes bandwidth
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