I worked on this along with some other people.
Here's what a demo looks like: https://i.makeagif.com/media/9-28-2017/gMnJTj.gif
You can try a really cool demo made with it here: https://expo.io/@nikki/dire-dire-ducks
It fills your room with water and has ducks swimming around. The sound changes if you dive underwater, and if you press the screen, the ducks will swim towards you. This is a video of what it looks like: https://www.youtube.com/watch?v=8EL1emCVtIw
And you can read more about it here: https://blog.expo.io/introducing-expo-ar-mobile-augmented-re...