If it's just Apron Control by the airport authority, I don't know, but if it's ATC it'll be a no-no; ATC are only permitted to use CCTV as a last resort when it's an 'old' facility where the view has been restricted by new developments and even then SRG would be very cautious of approving it; new ones must be designed so that the direct view is protected from development. The same might apply to airport authority facilities.