Update! The police just came to take a report. The officer was stern but nice (and heavily cologned) and I showed him what was happening outside our kitchen window. Part of me now hopes the camera is continuously recording, so the pervo has some lovely footage of a uniformed policeman staring at him and scribbling on a pad. The cop took my details and left to try to figure out who owns the house and who lives in that unit, so he can confront the weirdo and inform the landlord (perhaps they're one and the same!) and "get to the bottom of it." My voice was all shaky while I was explaining the situation, but I'm glad I didn't come off as a hysterical mess. I hope he tracks the camera owner down and puts the fear of God into him or her…though if he doesn't, my husband seems determined to do the job himself. Thank goodness for ballsier people than me. Well, except the kind who perform home-surveillance on their neighbors.
All that said, as soon as that camera's gone I'm getting myself right up in those windows…to measure them for blinds.