I love dialects! ^>^
I did a quick search and looked up the wikipedia page to learn it’s 東北弁 and than using that to continue my search. Found several videos that might interest you I’m sure you can find loads of stuff if you are fine with mono-lingual sources as well.
Example of what Tohoku-ben sounds like. Yeah, this is hard stuff to comprehend! 
that being said, it’s not impossible, if you know “how to listen” I feel, when you’ve gotten the gist of it. ^^
