try reinstalling your webcam driver.
Try to reset Skype Settings
after spending the whole day try to solve my web cam problem whilst in skype, and trust me i tried absolutely everything, the only thing that worked was uninstalling skype and reinstalling older version. my webcam now works. Fantastic.
Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. DirectX includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX APIs.
Download directx from microsoft if you are running windows and solve "web cam being used by another program" issue . Worked for me . regards george