By default, each Zoom input will display the participants camera and then switch to the participants screen sharing automatically when enabled.

To manually select the source for each participant, change this via the right click menu of the input.

Multiple Zoom inputs can be added to display both the Video (camera) and the Share (screen sharing) of the Participant at the same time.

Share Audio

Audio from a share can be heard by selecting either "Mixed" or "Share" as the Audio Source from the Input's right click menu.
Mixed will include all audio from a meeting included share, while Share will just contain the audio from the share only.