The Video mode is how you appear with your presentation. There are several arrangements, including being superimposed over your slides or in a picture-in-picture effect.
Green screen: the speaker is superimposed over a full screen presentation or image
Camera: the speaker is recorded 'as is'
Augmented reality: animations are superimposed over the speaker view
Screen only: shows the laptop or visualiser output only
Side by side videos: the speaker is presented on one side and the shared screen on the other
Picture in picture (PP): the speaker appears in a small box within the content/image being shared
Screen PIP: the speaker is presented against the green screen and a smaller box with content/image that is being shared will appear on the right.
The Content source is a visual you are superimposed over or displayed with. This could be a PowerPoint presentation on your laptop, or a background image from the Rapidmooc.
The different video modes will cover most user's needs. However, each of these video modes can be further modified to give a bespoke composition for your requirements.