First off.. This functions properly in desktop views in a normal browser. Just not safari on a iPhone.
When a mobile user presses the "play" icon on a video in the portfolio section of my website it does not play the video. The div just disappears. Can you troubleshoot the issue? I have spent several hours trying to nail it down and cant seem to find it.
I was testing on dolphin browser + android and have the same problem. I think vimeo have bugs with some browsers.
Try to watch a video from vimeo in your safari browser.
I can't play vimeo in my device + dolphin browser :S.
I tested your web page with a youtube video and work.