Toggle Flash While Taking Video
If you need to turn the flash on and off while you take a video, iOS 9 will let you do just that. On iOS 8 Apple allowed users to turn the flash on for a video, but this was not something that the user could change while shooting video.
On iOS 9 you can change the flash settings while you shoot video to add extra light when you need it and turn it off when you don't. This also helps when you start shooting a video and then figure out that you need more light, as you don't need to stop and start a new clip just to turn the flash on.