...UVC PTZ control to be more correct.
Open Skype, log in and click on the "..." icon and choose "Settings"
Go to the "Audio and Video" tab, select your camera from the list (here a CM4x recognized as "FHD camera") and recheck if it gives a live preview below.
Click on "Webcam settings" to open the properties window:
- Video Proc Amp (to adjust the Brightness, Contrast, hue,..)
- Camera Control (to control the PTZ functions of the camera):