sorry if I sound harsh, I am new here, but someone pointing a camera towards any of your property and places likes washroom, you should certainly teach them a lesson.
Call the cops and have them examine it, even if they are allowed to focus their camera anywhere, they cannot install it without a warning.
And what you have posted would count as "breaking someone's privacy" and spying or even monitoring without consent.
Iam sure above points should be enough to have them remove it by either a warning by cops, or better if they book them in some clause and have them stay in correction facility.
don't take it lightly or wait for a disaster,
had it been my window being watched, that guy would have his head broken already and then would have been sitting with cops in bandage.
