Super NEWB Question about Video Capturing and Aspect Ratio

Video Geeks -

I shot this video
http://www.youtube.com/watch?v=4zi2RWRYvG4

Basically didn't know what I was doing and was just holding the phone vertically. I am wondering if there is a way to do a conversion so that it looks a little better in a 16:9 widescreen player like youtube.

Do I need to make these adjustmetns with the .MOV file in some editor, BEFORE I upload to youtube? If so, how?

Thanks!

 

anyone?