Nightfall (2010) is a pretty good documentary about the history of vampire movies. It starts out with some good film clips from the silent era into the 1940s until the present. It explains the basis for the vampire as Vlad the Impaler, and Elizabeth Bathory and, of course, Bram Stoker's novel Dracula. It goes into the Bela Lugosi and Christopher Lee as the most original, popular portrayers of Dracula and how the vampire films changed and evolved over the years.
I think this subject is so vast that 87 minutes isn't long enough to fully cover all of the important vampire films that were produced over the years.
I'm sure there were budget constraints and other issues, but Nightfall would have been better if it were produced as a series or at least as a two-part documentary covering fifty years each.