Nice video. However though Jerome , the double tap to open the camera even when within the phone (phone unlocked) was there from marshmallow, i've been using the feature as long as i've had the phone . Its not new.
You've been long gone asleep for a long time. Android MM does include the double tap on wake button to launch the camera, even though the phone is on a current app or home screen, so yeah just thought you should know.