Thanks dunitall, I guessed thats what it was but it seems to be able to move in every direction, so hows that possible, if its on a wire going over the pitch ?
Chip, not sure maybe they have more than one camera and can use them for different areas, but I do know the shadow is a camera, I will have to watch more closely next match to see where the shadows are.
I do not know but it seems to me a camera could travel across the pitch on a wire, whilst the wire could be made to move up and down the pitch if it was supported by cables running down each side.