It is always a shot to make an opinion in this world where cell phones are urban mythed into bringing down jet liners, but a normal tv camera (no broadcast gear/antenna) should have no affect on the ship's systems.
An EMI test normally consists of trying all combinations of the gear while closely monitoring the gages, in a ground run. Should anything wiggle, get it to repeat, and then assess if it makes any operational difference. Most likely, it is the ship's radios that will affect the video, perhaps as snow on the recorded tape, or as a set of lines that march up or down the photographer's view screen while a radio call is being made.