Boronia is right – people can even film the inside of your home from outside your property, provided it is not for salacious or illegal purposes.
If this is a permanent or semi-permanent installation properly authorised by the EC (therefore a ‘corporate’ installation) under Health & Safety laws there has to be signage warning workers.
If it’s on Common Property, permission should be given by the EC.
But an individual taking action on his or her own to solve a problem may be a good thing, provided you can get assurances that the camera is not pointed at your budgie smugglers.