I think this is a cool idea, if you want people from around the country or world to "attend" your wedding. Also, I can see how those that might be stationed overseas would appreciate the idea, because it would allow them to participate as well.
While it might seem odd knowing that you are being broadcast around the world, it would only be accessible by those you provide the information too, and a videographer is a common thing at weddings these days. As long as you still invite guests and make the wedding ceremony what you want, I really can't see how the romance of it would disappear.