This step is needed so the Virtual Camera will work on your Mac when using OBS.
Note: Your interface may be different depending on the MacOS version you have. Using OBS and livestreaming at the same time might be too taxing for some computers. The recommended RAM is at least 8GB. OBS is a free third-party software. If you'll encounter issues using it, it's best to check their help page here.
If you wish to add a virtual background to your Live Event, here's how to do it. You may also add some background music from your computer, and patch a group video call. Here are other ways you can prepare for your session and some tips for when you're Live.