The camera output of my built in camera (Facetime HD, built in on Macbook Pro 2014) is mirrored. In the Vurofia Configuration I tried to flip the camera horizontally (under Webcam --> Flip Horizontally) and I also tried enabling "Mirror Video Background". Both configurations didn't change the output. It's weird, since the Facetime HD camera is in fact detected by Vuforia.
What would be a good workaround? I tried to flip the x-coordinates on all UV's on the camera render target in runtime, but this didn't have any effect.