Using the Camera Video Source Panel of CamMask.

Click "Camera" in Sources list, CamMask will show the Camera Video Source Panel.

• The Devices list will display all the Webcam devices in your system, you can chose one that you want to use. If there is only one webcam in your system, it will be selected as default.
• You can see the webcam frame in the preview area. If only a part of the webcam frame is needed, you could drag the rim line in preview area to set the needed area. The Zoom Bar will help you zoom the video frame(100%-400%)
• Click the "Properties" button, you could open the "Video Capture Properties window" of your OS.
• Click "Reset" button, the selected area and zoom level will restore default.