YourDoom did a blind defence series which is pretty outstanding. I have yet to see anything comparable, but that said I haven't really dabbled much in MTTs in about 2 years!

it comes in 6 parts, and its pretty in-depth.

IWEARGOGGLES also made some nice content relating to blind defence in MTTs if I recall, but again, its probably a bit dated now, although it was high stakes.

I would do my research on YourDoom first, before watching any of his content.

Thread about YourDooms integrity

I've not watched these videos, all I do know that his so called reputation backfired really hard on him after posting graphs allegedly claiming that he still crushes the game. All his content is either dated or might just not be good at all, and I wouldn't by all means assume they offer you a valid edge in todays game.

There are some more threads floating around on 2+2 concerning this guy, so just bear this in mind. 

p.s. not implying don't, but just research current events.

I guess it is now a good idea for next vids by our RIO coach. Blinds defense/Blinds attack

Thanks for the responses guys. I'm pretty happy with my cash game blind defence but am interested mostly in mid-late stage tournament play where the stacks are shallower. A few of the coaches have spoken about it to some degree in their videos but maybe we'll see a blind specific video at some stage