Rotate video to landscape?

[Beast of Haeven]

Is it possible to rotate a video I've taken to landscape? My idol 4S didn't recognize the video orientation as landscape due to the position I started the video in (phone facing down). I took a 6+ minute video at 720p of my new house and would like to share with friends and family who've been asking for progress updates. I've uploaded the video to OneDrive if anyone needs a link.