He was in plain sight!
Well.... I don't think he should be able to complain about anything that he did publicly being filmed. Anybody walking by on the street could have seen him mowing his lawn. I don't believe his rights were being violated. The private detectives filmed him doing public, outdoor activites - they did not invade the privacy of his home. Conversely, I have to say that he might have a legitimate injury but still occasionally be able to do a chore or two. Even when I had a bad back injury, I HAD to get into my car and get around now and then, because I lived alone and had no one to take me to medical appointments or the grocery store. Police officers have to drive A LOT and also be physically fit enough to give chase and lots of other things that a healthy back is required for.