This video is a really interesting technical piece. Footage made using a high speed camera in a high speed train results in this bizarre, surreal-looking, slow-motion-like video.
What makes this piece so unique is that normally a high speed camera is stationary whilst filming a high speed object (like a car chase), resulting in normal speed footage of a fast object. In this case the high speed camera is moving at high speed whilst filming normal objects (flying birds), resulting in normal objects in a high speed landscape. This then looks like slow motion birds in a normal speed landscape, giving it that surreal effect.