The action begins at the 60 second mark.
Here’s a great video showing the mirror and shutter mechanism in a Canon DSLR. The action begins 60 seconds in.
Keep in mind that the entire real-time duration of the mirror swinging up, the shutter coming down, the exposure, the shutter coming back up and the mirror swinging down is .213 seconds.
Great find, Tom!
Filed under: Photography, Science and Technology, Video Tagged: canon, dslr, high speed video, mirror, shutter