1. A method of capturing a video of a scene depending on the speed of motion in the scene, comprising: (a) capturing a video of the scene; (b) determining the relative speed of motion within a first region of the video of the scene with respect to the speed of motion within a second region of the video of the scene; and (c) causing a capture rate of the first region of the video of the scene to be greater than a capture rate of the second region of the video of the scene, or causing an exposure time of the first region to be less than exposure time of the second region.