The UK spy/surveillance HQ at GCHQ has recently been outed for a program called Optic Nerve that stole Yahoo webcam footage from webchats from innocent, unsuspecting webchatters. It's also become clear that Microsoft's Xbox 360 and Xbox One Kinect camera has also been considered for such use.
The Guardian newspaper has been publishing documents that came to light via the US Whistle Blower Edward Snowden. Some of these from GCHQ have brought the use of webcams in citizen's houses to light.
The paper also reports, however, that, "While the (unearthed GCHQ) documents do not detail efforts as widescale as those against Yahoo users, one presentation discusses with interest the potential and capabilities of the Xbox 360's Kinect camera, saying it generated "fairly normal webcam traffic" and was being evaluated as part of a wider program."
There's nothing yet to suggest that it use of Kinect footage was useful to the spies. But there's nothing to suggest it didn't either.