1. A method, comprising: transforming frames in an input video to comprise different scales; obtaining absolute movement trajectories corresponding to the different scales by tracking movement points from the transformed frames; transforming the absolute movement trajectories to comprise original scales; obtaining a relative movement trajectory by matching the transformed absolute movement trajectories; and obtaining a trajectory descriptor from the relative movement trajectory, extracting a movement trajectory feature of an object from the absolute movement trajectories; coding the extracted movement trajectory feature; determining a type of a movement of the object based on the coded movement trajectory feature; wherein the movement trajectory feature comprises the relative movement trajectory and the trajectory descriptor.