What You'll Need - Green Backdrop - Good Lighting - A Good Webcam 1. Add a video capture device to Global Sources. 2. Select your preferred webcam by double-clicking the video capture device and choosing your webcam from 'Device' dropdown. 3. Preview the scene. You should see your camera's video. 4. Right-click on the video capture device in the global source list and select 'properties'. 5. Check the 'Use Chroma Key' box and click the 'Color' to open a color palette. 6. Select a color that is closest to your backdrop shade. 7. Tweak the Similarity/Blend values until you get a good chromakey settings that works for you.