When you go to the movie theater, do you lie down on your side in the front row and watch like that? Is that what you like, you freaky bastards?
If you hold your camera like this…
… then your video will look like this:
If, however, you hold your phone the way the movie screen looks…
… then your video will look like this: 
Got it?
(Also, stop pointing your camera AT the light. When in doubt, put the light source behind you.)