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HERE IS HOW IT IS DONE
First you need to be in a glitch spot (grenade glitch works good).
then you need that person to stay in there for a good amount of rounds
you'll start to see zombies glitching and going to windows in areas that aren't open.
At this point you want to get at least 1 board on every window and a rock on the walls.
If done correctly the zombies will walk up to window and still be oddly glitched starting the next round. (know that this can't be done with one person, and I advice the person in the glitch to stay there and have the other people go do this)
if they are still coming through one window try attempting boarding it fully, and continuing to do it until it glitches
+Rep and Thank if this helped or you liked it Please
[ame="
https://www.youtube.com/watch?v=PJn8LINWpwk"]YouTube - Call of Duty Nazi Zombie Verruckt Glitch[/ame]
EDIT: WORKS NOW