If you know where to look you can find the videos that are used for macOS Sonoma screen savers. But the format won't work as a background in Zoom. However, you can convert it to a format that does work pretty easily.
Note: This is Club MacMost exclusive content. To view this video click the thumbnail below to go to the post as Patreon.com. Once there you will be able to view the video as long as you are logged into your Patreon account and a current supporter of MacMost at the "Club MacMost" or higher level.