How do video photographers focus when running?

Now most cameras can focus automatically. Video shooting is different from photography. Shooting the subject of an action doesn't necessarily need to be as detailed as photography, sometimes it just shows the audience the process of an action. As for the details of the subject, close-ups or close-ups are needed; And close-up, the focus of the subject's action is very easy. If it is the main action of shooting panorama, focusing is easy.