Whale of a good hologram?

This is a pretty spectacular little video of what purports to be a hologram.  The effect is quite amazing, but is this a 3D image really being projected into the gymnasium or is this a bit of video trickery, where one bit of video is superimposed upon an other?  The spectators certainly react as though they are seeing the image, but the area is pretty bright and there is no obvious projection equipment visible.  What do you think?  Is this a really amazing hologram or a bit of video trickery?  Inquiring minds want to know.