Hi as far as I can work out the hub will have a power in , IF you have the naza FCB the servo wires from the gimbal plug in to the FCB
I have looked again at the link now my head is in gear, this needs the Phantom2 to work so may be just get the FPV kit as this works on the flame wheel , once you have it your be able to see it better , the FPV tx will take power from the quads battery, this in turn powers the FPV camera
The monitor has a built in battery and normally power the FPV receiver so that s it really , but if the worse happens we can power the FPV receiver with a small 7.4v lipo, so it will still all work