FBX model for 2d sprite charachter.

I was following along the unity platformer tutorial. https://www.youtube.com/watch?v=9WhZ1svdC3Q It is great. After looking the animation I found that there was a fbx model for 2d sprite character. I just want to ask can you use 3d animation like motion capture animation once you rig a character using bone for 2d(fbx model). I search but unable to find any good tutorial of how to create fbx model for 2d character and creating maps for these 2d character.

I am really confused. Thank you so much for helping.