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We propose to develop a tracking algorithm of objects or humans, based on kinematics, with a fix ed monochromatic camera, without any knowledge on the sequence: siz e, shape or number of objects are unknown and can evolve with time. For this purpose, we first make a motion detection, then, as we suppose that people move locally in a consistent way and thus draw a regular trajectory in the spatio-temporal space, we modeliz e locally the 3D moving points by a mix ture of Gaussians where eachdblp:conf/mva/AchardMM05 fatcat:wdjfpfig2faqrmth6amrz3wuum