How to use lvgl to implement picture-in-picture feature

Hi, I’d like to use lvgl to implement a video chatting app for a smartwatch. In Whatsapp, you can see a picture-in-picture displaying yourself beside the remote side when you are doing a video call. But I’m not sure how to implement this feature with lvgl? I suppose we need a small video container layer be on top of a big video container? Any examples would be helpful. Thanks in advance!