Motion Capture (MoCap) means to record and analyze human movements. Nearly all commercial products in this field rely on artificial markers, which have to be attached to the person. These markers are usually reconstructed from cameras and used to determine the position and orientation as well as the involved joint angles of the person. In contrast to these reliable marker based tracking systems exist so-called marker-less systems subject to recent research in the fields of Computergraphics, Computer vision and Biomechanics. In this article, we describe current aspects of research which allow for pose tracking of persons without manual intervention, e.g. the use of markers, just by using image data.