011284mm: A very interesting snippet of time for all of Europe, the 18-1900's was I guess rather more interesting in Germany.
I could not find any actual documentary's on the unification (I am rather disappointed as I was sure there was one from the BBC), but I hope this might be interesting. All are in English as I cannot check German links - my German is atrocious to non-existent.
Tom Richey - German Unification Part 1/3
https://www.youtube.com/watch?v=Y2SlWfmwQik It is a short run trough of the time to help US students study.
From the BBC
http://www.bbc.co.uk/bitesize/higher/history/nationalism/unification/revision/1/
A rather short bit of information about the time, again it appears to be more of a study aid then a teaching tool.
A lecture by Professor Richard J Evans from Gresham College
https://vimeo.com/22227918 (not watched)
Extra Credits - World War I: The Seminal Tragedy - Chapter 1
https://www.youtube.com/watch?v=S-wSL4WqUws&index=5&list=PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu A short and simplistic set of episodes about the lead up to WW1. Not a bad series either.