John Mayer became the first musician to create an Augmented Reality Video. Through the use of AR, fans are actually put into the video. When a special AR Marker is held up to the user's webcam, Mayer’s 3-D music video begins. The webcam then transmits images of the viewer's face on screen, and the viewer appears as an extra behind Mayer as he performs his song Heartbreak Warfare.
http://www.wired.com/underwire/2009/10/john-mayer-augmented-reality-video/


John Mayer "Heartbreak Warfare" Official Augmented Reality Music Video'http://www.youtube.com/watch?v=CZtRHVMcZjI


See Mayer talking to Wired about the making of the AR video

http://www.youtube.com/watch?v=VfMeGzKGCok John Mayer Broods Over Augmented Reality


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