Definately not 1/1million (which equal to 1 million fps)... I would say those footages were shot at about a 5,000 fps and some even at 500fps. According a slo-mo technician that I worked with, he said the fastest camera he used was a 100,000 fps camera, which he used to shot for US government on some secert projects which he can't disclose.
P.S. come to think of it, may be he did capture at 1 million fps, but he speed up the footages so they won't be too slow to watch...
