Ok, a 7D shoots with 60 fps. What made this 1000fps slowmotion possible? It’s a plugin called Twixtor. This is how RE:Vision Effects (the creator of this plugin) explains Twixtor:

Twixtor synthesizes unique new frames by warping and interpolating frames of the original sequence… employing RE:Vision’s proprietary tracking technology that calculates motion for each individual pixel.

Twixtor is compatible with Final Cut Pro, After Effects, Adobe Premiere and several others. The video!