Shooting video with a Canon 7D Mark II with 800mm with 2x extender

I was shooting this little eastern screech owl with my new Canon 7D Mark II. I was using the Canon 2x extender with a Canon 800mm lens. I was extremely happy to see the 7D Mark II autofocus without a problem even with the 2x extender. When taking photos with the 2x extender, I have to manually focus unfortunately... So I am extremely happy to see it focus so effortlessly with it when shooting video