There are some paid apps that will allow you to make the video/camera flash light to be used like you are describing, but the easiest way I found is to just make one of the side convenience keys the video application, and if its dark enough it will light the way for you to do anything. I was surprised how bright this little light was. That's how I do it anyway. ;)
One out of four people in this country are mentally unbalanced.
Think of your three closest friends. If they seem normal
you're the one!