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Body Tracking Algorithms without RGB?

I have an Xtion Pro, which provides a depth sensor but not an RGB sensor. I would like to perform body tracking using OpenCV, and I only want to detect only upper body (torso and up). I have one moving camera at a fixed height (chest-level to the person). I have researched several ways of doing so such as: HOG, LBP, HAAR, latent SVM, and Kalman tracking. I would like to find out however if these methods can be implemented in an algorithm without an RGB sensor. If so, which methods would you suggest and why? If not, are there other methods using only depth sensing?

Thank you for your time!