How to add in-video ads

I have a code like this:

<!-- Generated by AdXpansion -->
<script type='text/javascript'>
var adx_displayonload=1;
var adx_isad_display = 1;
</script>
<script type='text/javascript'src='http://ads.adxpansion.com/public/js/showads.php?zone_id=101683&ver=1&type=flowplayer'> </sript>
<!-- End of AdXpansion code -->

…and I would like to add it to the plugin, so it is showing in video ads on the sites that are using it. I would also need to create an array and display ads depending on the domain name, but it should not be a problem. Can you point me in the right direction, as far as where this code should go?

Thank you.