@Modesyn,
You need to draw the line on this. If you send him the video and you two break up, (or even if you stay together) there is nothing stopping him from sharing this with his buddies or even worse, putting it out on the internet.
Do you really want to take a chance that friends, family, or some future guy you meet will be able to go online and see the video of you giving head to someone?
As said by a previous poster, make it clear that this is a line you will not cross. If he keeps bugging you about it, then maybe you need to rethink this relationship.