Vertical recorded video from iPhone shows black gaps on my mac?

I have recorded a video from my iphone 5 in horizontal mode and it plays great on my mac with 1920x1080 resolution 16:9 aspect ratio. I have also recorded a video vertically from my iphone and when i save it on my mac i get 1080x1920 with ratio 6:19. Is there a way to show the video full screen without the black gaps right and left on my mac? Can i use a program to do this? Any help appreciated!