I'm trying to find a background for zoom.

I'm trying to find a background for zoom.By the way I'm on iPad.

You may use one of the images created by our graphic designers as you've seen in the article, or based on what I've researched, it looks like you can use any image as Zoom's background image or you can also choose from Zoom's predefined choices.

Please see Zoom's guide for such feature:

Understanding-Your-Account-Usage-and-Limits