Well if you're looking to animate someone with those movements, you will want to look in the right place of course. You will not likely find someone wielding an axe or spear properly, but martial arts, such as my own still love to play with staffs, I have used the bo like a spear/naginata before, you will want to try and learn the mechanics of the movements first, I mean with your own body, it usually helps when looking at your rigged 3D model once you've done the movement yourself, I mean a curtain pole is good enough.
Also you will want to consider the weight of the object, a two handed axe will be quite heavy, so the character will have bent knees and will move quite slowly, I modelled an Orc with a 2-handed axe in a standing stance, it looks like he is sitting on the toilet, but there may be reference there.
If you want to find video footage, try searching things such as 'bo' or 'jo', I'm sure You tube may have videos, they're usually good for finding videos on martial arts. As you're not going to use motion capture, these sort of resources should be helpful in know what your model should look like when animating it, as you would with a walk cycle, look at the angle each part the demonstrator is at.
Here are some resources I have found for you, I hope they're useful.
http://www.houstonbudo.com/KOBUDO.HTM
http://www.youtube.com/watch?v=SnjUuFaj9DQ
And this one looks a bit crazy
http://www.youtube.com/watch?v=snFilmk3lKk
http://www.youtube.com/watch?v=yvgewhVin34
And the youtube search I did:
http://www.youtube.com/results?search_query=Bo+kata&search=Search
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