Select game objects with RectilePointer

I've created a game with Unity 5.6.0f3 and the user has the possibility to select a game object by clicking on it. Now, I want to replace this method of selection. If the user targets the game object with the GazePointer, something like an hourglass should run and after 6 seconds, the game object is selected. How can this be done? Hopefully, the description was comprehensible.... The main camera is VRMain, cause the game should be exported as a google cardboard app (That's also the reason, why it can't be clickable). Thanks in advance!