Hand pattern recognition

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Hello. Let me explain a little what i want and need; I have an application where i need to calculate stress posture of a hand, intuitivness of position, stress and so on. But this should be very fast, for video processing. I am recognizing the hand, i have the exactly shape but is not enough for what i want. I want to check the current hand position with a set of images, and for that images i know the stress, position, etc. What i want to ask, is in open cv a function that can tell me wich of the stored image is the same or the closest with my current image wich is processed? I dont need a very good one but a fast one is preffered. Or, if you have another idea how to solve that, please tell me. Thanks!