Masking the Video and Webcam layers in the Timeline

In the Video Demo project, both the screen recording and the webcam recordings are visible all the time. If you wish to hide one of the feeds during the playback of the Video Demo, you can use the Mask feature to hide a video feed for a defined amount of time. 

For example, when you are introducing the topic, concluding it, or explaining a concept, you can hide the screen capture recording and just show the webcam feed. Similarly, if you want the students to concentrate on the step you are showing instead of looking at the webcam feed, you can mask the webcam feed. 

Let's take a look at the steps to do that:

1. In the encoderVideo.cpvc file, open the Timeline. 
2. Move the Playhead to the beginning of the video.
3. Then, select the Video/Audio layer in the Timeline.
4. Click the Mask Video button:

5. You can see two black handles, used to make a selection on the Timeline to mask the video. Move the...