FYI, I played with this a few minutes and got the following to work:
- type: picture-elements
title: Picture Elements w Stream
image: /local/FloorPlanExample.jpg
elements:
- type: image
entity: light.end_table_lamp
camera_image: camera.my_camera_ffmpeg
camera_view: live
What I get is an floor plan as the main background which contains a small window with motion video sourced from my_camera_ffmpeg. When you tap on the motion video window you get pop up of more-info of the end table lamp (which is the default action).
I did set entity: to that of the camera, but that didn’t work.