One way you could do this is to have a link to the video stored in the record for that location. You can then just reference that link value dynamically in the custom info window. Here is an example of what you would add to the custom info window to get this value to show if you store it in the same table:
info window text
<?php echo $row_rsVacation['video_link'] ?>
So long as the links to the video are stored in the table along with the location info you should be able to reference it like this and get a link to the video.