1. A system for editing videos based on movement captured within the videos, the system comprising: physical storage media storing video information defining video content, the video content including video frames; one or more physical processors configured by machine readable instructions to: access the video information defining the video content; determine motion vectors for the video frames, the motion vectors representing motion of one or more visuals captured within individual video frames; determine a transformation matrix for the video frames based on the motion vectors, the transformation matrix characterizing rigid transformations between pairs of the video frames; determine shakiness metrics for the video frames based on the transformation matrix; obtain a shakiness threshold; and identify one or more of the video frames based on the shakiness metrics and the shakiness threshold; generate a video summary of the video content, the video summary including the one or more identified video frames.