We research and develop fast and reliable algorithms for detection and tracking of whole body movements as well as movements of specific body parts. Our solutions focus on body, head, eye, hand and finger tracking as well as posture, movement and gait analysis. Our algorithms are based on non-intrusive, marker less sensors which provide 2D and/or 3D video signals, e.g. colour, depth-from stereo, time of flight or structured light. These algorithms are designed to work with a variety of cameras from low cost, mobile to high-end devices finding a best compromise between performance and price, from offline behaviour analysis to real-time human-computer interaction.