Do you ever watch video tutorials on YouTube, or ever watched a recorded Zoom meeting. Have you ever wondered how they capture all of those elements; the desktop environment, the web-browser, special software they maybe demonstrating, and of course meeting participance. They could be using a commercial software like Camtasia that cost $225 and doesn’t do everything you’ve seen or they may use OBS Studio a free software. In fact OBS is what almost everyone uses.
OBS was at first adopted by gamers that were stream games to Twitch (like YouTube for gamers). It was discovered by people how wanted to demonstrate things on YouTube. After that people wanted to live stream there Zoom (and other meeting site) meetings. OBS Studio is how they do it.