This is what I think they did. This video is made of still images, lots of which have long exposure to get the painted light look. all of the stills were put in a time line at one frame long for each still. Then it was precomposed. Take that pre-comp and time stretched the crap out of it to line up the stills with the music. Then they had frame blending put on pixel motion, which will give that blurry distorted weird background look. No 3rd party plugins involved.