The iPhone 13 has a built-in video mode called “Cinematic” and there’s an ad running on TV where it’s demonstrated. I hadn’t looked up any instructions, but figured that Apple products are usually pretty intuitive, so I decided on short notice (the ad had just come on TV) to see if my intuitions were correct.
While recording the video in Cinematic mode, just touch the screen to indicate where you would like to focus. In this video, watch as the focus shifts from the soda can in the foreground, the KC Chiefs hat behind that, and the television showing the Apple iPhone ad in the distance.
This is pretty cool!