There is no camera (Spoilers)
I live in Paris. After watching this movie I went to the street of Georges' house. I tried to move around to estimate where the so called camera could have been placed.
In the movie, the view from the camera gives the impression that it was sitting atop a vehicle, slightly taller than a regular car. It also seems to be a little too far to the left, with a slight low angle.
In addition, there’s nothing in the opposing street to hide a camera, or at least, without the knowledge of a resident who could have identified the person setting the camera up.
Truly, the camera set up is not meant to be credible and anyone attempting to do the same would be caught.
That’s why I think the tapes and the hidden camera plot is a metaphorical mechanism to bring up Georges’ guilt and/or painful memory, as it is not that obvious that Georges is remorseful.
I thought that his mother illness played a significant role in Georges being upset.