SIGGRAPH throws up a lot. There is a video on fastcompany.tv with Scoble and a professor I think from Harvard talking about recent events that year.
shows something like it.
You can delete sections of the image post production. Get some pictures without a subject, or with something in, then take the video, then merge the two. Either add or subtract whatever you want.
This is going beyond any repetitive simple pattern being used to alter a section of an image. This is large alterations. the tech has been there in different guises, but to see it after a while, you see the jumps the area is making. It could be used for good, but also for bad.