Hi Idnoble
You just do a MySQL query and then stick the path to the file in the link, i.e.
$sql=mysql_query("SELECT vid_file_path FROM mytable WHERE ID='$id'");
$result=mysql_fetch_array($sql);
print "<a href=\"" . $result["vid_file_path"] . "\">Check out this vid!</a>";
Does that answer your question? To the best of my knowledge, you can't 'reference' anything in the database in the way you mean, i.e. you call up the file path from the DB and it automatically calls up the vid file.
HTH
Norm