Why IR ? Why not just regular floodlights ? If the neighbor complainns tell the cops he is so paranoid to have cameras, you too want to help stop crime. So you are HELPING the neighvbor in hia quest to be secure.

Tha tneighbor is s ****ing ninny. You know how hard it is to get nayone busted for anytihng unless they are a taerget ? Of course this varies by area. WWe have a suburb around here where the neighbors call the law if you have a jetski in your driveway. Ironically the name of that city is "Independence".

Anyway, with "proper" lighting you can obscure it pretty good because caeras only have so much contrast ratio. then the iris has to close up. Infrared might or might not work. Since it is an outdoor camera it is probably IR sensitive for lowlight operation. Howevr there is plenty of justification for floodlights, putting up IR beacons when you personally have a camera to pick it up might be construed as interfering with the asshole's ability/attempts to be secure. Surely the asshole duidn't tell the cops the intent of his camera was to spy on your friend, the cops would have not sided with him if he said that.

the BIG proble is if this asshole has connections downtown. THAT is a big problem because this entire government runs on the budddy system. In some localities it is alot worse.

If noting else, mount a floodlight right by the daughter's bedroom wind pointin pretty much at the camera but not exactly. It doesn't have to be exact.. As long as a high intensity light source is visible to that camera, its iris will have to close up.