macOS Sequoia 15
Change your background during a video call
With macOS Sequoia, you can choose a virtual background in FaceTime and compatible third-party videoconferencing apps. You can change your background while using a Mac with Apple silicon, or while using your compatible iPhone as a webcam. See Use video conferencing features on Mac.
During a video call, click 
in the menu bar, then select Background. Click the background preview to choose a colour, a built-in image or an image of your own.