I'm a beginner too, don't do what I say
From what I know, it should work if you flash the stock recovery through ADB from this thread:
AIO VZW M8 Developer Resource Thread
And then installing the OTA.
From what I (think) i (might possibly) know: An OTA installs "stuff" through the stock recovery, therefore if you have a custom one it wont work.
As I said, I'm a beginner too. If you do what I said above, there is a decent chance it wont work. That's because I'm guessing.
So if you are bored and have 500 spare M8s laying around, go for it.. Otherwise wait for a more experienced guy to find this thread.
(this post is my way of saying that I'm curious too.)
Sorry I couldn't be more helpful.