All those games were actually just CGI animations demonstrating the technology without showing any real gameplay, meaning none of those games were real, but I suppose they are possible, but probably won't work out as perfect as they appear in the video. For instance, in Kinect Joyride, you can change the color of your car by putting an object that's the color you want and placing it in front of the camera, but the details on the object, such as stripes and logos, don't appear.

I was browsing the web the other day and found this announcement that Microsoft had bought a company that made 3D motion cameras, and how it might be used in future. Interesting stuff to see Kinect long before we knew what it was!