Blizzard Entertainment used InterSense VCam Technology to develop the Starcraft II and Diablo III Cinematics according to MSNBC. The InterSense VCam will be showcased at the GDC 2009 during a demonstration. This technology was formerly used in the films Beowulf (2007) and A Christmas Carol (2009). The VCam allows the director to operate a physical camera in a virtual environment, enabling more lifelike, feature-film-quality cinematography in game cinematics.
Source: MSNBC and InterSense website