Unity3D + HTc Vive : VR Analytics

I need a script written so that the Camera knows what you are looking at ( example : Looking through a car window, or looking at the wheel, or gear stick ) and tracks that info and how long you looked at it in order -- Example : App start Windshield : 3.4 seconds Phone : 6.7 seconds Windshield : 1 seconds Wheel : 1 Second etc... If the work goes well I have a bunch of tiny scripts that need to be done.