Use ARToolkit to track and visualize 3D objects in live-video.
Usage: ARToolkitDemo([lightson = 0][, objtype = 3][, multiMarker = 2])
multiMarker = If set to 2 (default), track single markers. If set to 1,
track so called multi markers or composite markers for more robustness
against occlusion of single markers. A setting of 3 (=1+2) should track
both types of markers simultaneously, but this doesn’t seem to work well