Iphone - How do I make videos go in portrait mode?

I have a video saved into my Iphone but how do I make it go into portrait mode/vertical. I mean my video is vertically filmed but I'm forced to watch it horizontally? I tried using the Assistive Touch thing to force it to go to the portrait mode but nothing happens.

Added (1). @?: I know, but it doesn't work. Restarting doesn't work either.

Portrait/landscape depends on how you're holding the phone. The sensors will detect it and play the media accordingly.
If its not working, restart your phone and try again.

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