It's possible to place a object inside inside of the marker in the Map, like a movie of youtube.

<div id=myvideo height=350 width=425><object height=350 width=425><param name=movie value=http://www.youtube.com/v/IDtdQ8bTvRc><param name=wmode value=transparent><embed src=http://www.youtube.com/v/IDtdQ8bTvRc type=application/x-shockwave-flash wmode=transparent height=325 width=400></object></div>

Don't place (double) quotes in the text. If you need a space in the linkTitle use "& nbsp;"

Use plugin EasyTube (see: Home page or Joomla extensions)  and enter ['youtube:URL] or ['googlevideo:url] in the text parameter (remove quote after [ ):

{mosmap text='<div id=myvideo style=height:350px;width:425px>['youtube:url]</div>'}