OBS Studio is a swiss-army knife of online content creation. You can record, stream and with OBS Studio 26, you now have a built-in virtual webcam. Create a scene and with a simple click of a button, convert the scene into a virtual camera that can be projected in ZOOM or other online meeting platforms.
I recently used OBS to create a Toastmaster speech of 6 minute duration. The objective of the speech was to present a topic on any subject and demonstrate good research and presentation techniques. I created multiple scenes using OBS to show statistics, videos, images to create a speech on the safety aspects of scuba diving.
This was the final result
If you want to learn more about OBS, you will find this video on scene creation useful.