Fly on the wall

Fly on the wall is a style of documentary-making used in film and television. The name derived from the idea that events are seen candidly, as a fly on a wall might see them. In the purest form of fly-on-the-wall documentary-making, the camera crew works as unobtrusively as possible; however, it is also common for participants to be interviewed, often by an off-camera voice.

I am quite interested in looking at peoples behavior when they are either unaware of a camera's presence or of being watched and how this effects the way they act.