Index: wp-includes/class-oembed.php
===================================================================
--- wp-includes/class-oembed.php	(revision 17444)
+++ wp-includes/class-oembed.php	(working copy)
@@ -248,6 +248,8 @@
 			case 'video':
 			case 'rich':
 				$return = ( !empty($data->html) ) ? $data->html : false;
+				if ( is_admin_bar_showing() )
+				 	$return = str_replace('</param><embed', '</param><param name="wmode" value="opaque"></param><embed wmode="opaque"', $return );
 				break;
 
 			case 'link':