How to make IPhone 4S videos clearer?

So I recorded this amazing dance at a competition and I sent it to my friends. I playbacked the video and it was completely blury, even though I wasn't that far away. So how do I make the video less blurry?

Once it's blurry, you can't do much with it.

Like putting a scrambled egg back together.

It must be that the lens is scratched or it's been blurred by your own fingerprints!

If you clean both the screen and the back including the camera slot with a napkin wet in vinegar or eu du toilette (alcohol in it works like a charm), it will leave the phone looking really clean from all the smudges left by your hands!

I noticed this when a friend of mine sent his video to me, it was really blurry.
I teased him that his phone must be really dirty and stuff haha.