Linking video games and art history is a big project of mine that I've been wanting to tackle for at least a few years now. From the comments I've received so far about my speculations, it seems like this is a subject many others are curious about as well.
I recently edited and uploaded a second video exploring this thread, and compared the helmets from the game Dark Souls to those they resemble in history. Some key examples include Panjurli Bhuta (or, 'Boar Spirit') masks, Ancient Greek tragedy masks, and German Great Helms.
Here's the video: