Motion capture has various techniques that are used to record movements and translate it to data which can be interpreted and represented by the computer. Optical-passive motion capture uses retroflective markers which are attached to the person or object and these reflect the infrared light generated by the camera. The computer can then analyse the light to produce a 3D image of the movement. While optical-active motion capture uses markers that emit LED light which are then captured by the camera and analysed in a similar way. Inertial motion capture doesn’t rely on cameras and instead use inertial movement units with built in sensors to detect position and movement. Markerless motion capture doesn’t require cameras and uses multiple depth sensitive cameras to record the movement which can then be reconstructed into the 3D image. The method used is dependent on the application. 

Motion captures can be used to design characters and their movements in video games. It can also be used to play video games by monitoring players movements and using that to control the game. These techniques are also used in medicine to track patients movements to help with treatments of injuries.