How to mirror live camera (google hangout, skype..) on MacBook Air

When I capture live video from my front facing built in camera on my MacBook Air, it mirrors the actual image. This is fine but when I am having a Skype call or Google Hangout any signage in the background, text on a whiteboard or even the logo on my shirt is reversed. I have seen several options to reverse the video or picture after it is captured, but I am seeking a solution to change the camera in live applications.