This is Mixed Reality for poor people, the idea is use the phone's camera to emulate the "optical see through" effect, also to test how the "mono to stereo" affect the experience, all you need is your android phone and a google cardboard v1 (with a hole for the phone's camera)
ARtoolkit + unity
apk: https://developer.cloud.unity3d.com/share/WyIIv6TiHz/
target: https://github.com/artoolkit/artoolkit5/blob/master/doc/patterns/Hiro%20pattern.pdf
vuforia + unity