aspect ratio of camera

I'm not able to use a virtual background on a Zoom meeting. The background is too large and some of the image can't be seen. It was suggested to me that I should change the aspect ratio of the background to the same as my camera. Does that make sense? I have the latest 5th generation iPad mini.

My question is what is the aspect ratio of the camera? Where do I find the specs for it?

I hope you can help. Thanks.