Doug- Have you found a solution to this yet? I have the same problem with embedded video on my iPad. I have a WordPress website (advancethedialog.com), and embedded video (at bottom & in Feb 19, 2013 post) plays fine on my Mac using Safari, but on iPad, also using Safari, it doesn't even display. If I go to the site I got it from, it plays fine. But the embedding code I grab from those sites (CNN & CNBC) to use for mine, only works on the Mac. I have an iPad2 with iOS 6.1.
This is frustrating!
Apologies for also posting this on https://discussions.apple.com/message/20246111#20246111, but I am desperate!
Mimi