Google Tango's motion tracking capabilities embedded all together with 3D stereoscopic cameras to which the "Tango AR Screen" script has been previously added. In the Tango Manager the option "Enable Video Overlay -> Texture and Raw Bytes" has been selected. This adds the Augmented Reality effect by overlaying the camera video rendering onto the virtual world.
Running on an ASUS Zenfone AR mobile phone. Videos might appear to be shaky and slow, but actually the application is running fine and smooth, it's just the video recording settings.