Long before Autodesk Labs showed augmented reality on AU main stage and in the Discovery Space in the AU Exhibit Hall, Eddy Kuo and Brian Pene had this prototype working for adding 3D computer models to real world scenes at the Customer Briefing Center at One Market in San Francisco.
This is typically made possible by inserting a marker into a scene, viewing the scene with a video camera, and using computer software to replace the marker with an image of the model. As the marker is moved, the computer model is correspondingly moved, and the streaming video is updated. All of this happens in real time.