Paper and video: http://www.rendering.ovgu.de/publikationen.html
The paper also contains some results of voxel-based path tracing, which are unfortunately not shown in the video.
The voxel grid allows a coarse scene representation, which is much cheaper for calculating real-time GI. Pixar, PDI Dreamworks and VoxLOD use a similar technique (see http://raytracey.blogspot.com/2010/08/faster-raytraced-global-illumination-by.html)
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