"It's finally here. GameBlender - ARToolKit demo contains camera tracking in GameBlender's virtual scene, as it is shown in Little man video. To get it working, you need to install Texture plug-in and PyARToolKit module. (I've sorted out some bugs in Texture plug-in, so I suggest to download actual version)."
Short about the project: They import a video stream into blender and use some scripts to real-time camera track the streamed content. Then they are able to move the camera in blender with their real camera. Take a look at it: