We need a gaze/stare button to go from one room to the other -- 2

There are 2 boxes in the scene, each representing a room. We need help with the following problems: - We need a gaze/stare button to go from one room to the other. Gaze/stare button = a button to look at, and after a time span of 3 seconds the camera will need to go to the next room. It has to be 3 seconds otherwise the interval will be too long. - If you're in one of the rooms you can see the other room through the wall. If you're in one of the rooms the other needs to be invisible so you can't see it through the wall. -It has to be built to an Android Application so we can run in on the Samsung Gear VR.