Overview
Some laptops like the Microsoft Surface Pro have two cameras, a front-facing and a rear-facing camera.
Depending on which camera is preferred, enable or disable the specific camera in the Device Manager settings of the computer.
Steps
Open up Device Manager (Right-click on the Windows menu and select Device Manager)
Scroll down to System Devices; click to expand the menu.
Double click on either Microsoft Camera Front or Microsoft Camera Rear
Select Enable Device on the camera needed; Select Disable Device on the other.