Dnpbakon, i just rode the bike in that video, my friend was controlling the drone and as far as i know, was fully automatic auto focus.
We just made another video (this time was me on the beach controlling the drone) one week ago testing the active track mode over the water and worked really well also, check it on our channel
It behaved really well, i spend the whole time with the remote in my hand just in case of emergency, but nothing happens, we had 20 minutes of footage with only active mode on. fully automatic.
but it was over water, not between trees. but still, very cool technology
cheers!!