A demo I did at the MD.I Hub for an automotive customer. It combines the Oculus Rift (VR headset) and ZED Mini (stereo camera) to create a mixed-reality experience.
The green screen is used to define the physical space in which the virtual reality is displayed. This enables the VR user to interact with the virtual environment without being cut off from her surroundings.
Engine: Unity 3D
Platform: Oculus Rift + ZED Mini