Re: video
Well... generally only the Hunter's Association is aware of the existence of vampires among humans. The government keeps the existence of vampires a secret.
[For better or worse.]
Thousands of years ago there was a large group of pureblood who attempted to take over. They would have, probably, if it wasn't for another group that didn't agree with them or their methods. They were able to create a weapons from the sacrifice of one that would allow them to kill even a pureblood, if properly done. So in the end with the help of those vampires and the one who sacrificed herself they were able to get the situation under control.
[She sighs heavily.] I'd say tensions between hunters and vampires has always been pretty tense, though.