1. Living in a terrace requires compromise. You have to accept that your new neighbour is different from your old neighbour.
2. You ask why he has a camera high up on the rear of his house which backs on to farmland. Perhaps he's worried about persons accessing his house & garden (where you say he's got a TV & a hot-tub) from the open land to the rear?
3. Do you know that the camera is active & not just a dummy?
4. If I was your neighbour, I'd be less than happy to know that you've taken a picture of (what appears to be) my bedroom window & posted it on the internet to illustrate a point about your privacy.