How to hide it and still keep it playing? Please. (:

It used yo be. It's part of the coding. You have to ask the person who codes your pro to do it.
try this?
.media_player {
width: 1px;
height: 1px;
}
You can set your video to autoplay and then by using this code you'll pretty much be making your youtube video 1px by 1px dot xD
or
{
filter:alpha(opacity=0);
opacity:.0;}
Which will make it invisible, but it'll still be the same size.
Hope that helps!