1. A computer implemented method for analyzing video data including a plurality of people, the method comprising: receiving an identification of a person of interest in an image; detecting one or more moving persons in a frame for each frame in a plurality of frames of comparison video data, wherein the plurality of frames of comparison video data does not include an image of the person of interest; creating a record including image data from a subsection of the frame associated with the detected moving person for each of the detected moving persons and for each of the plurality of frames of comparison video data; creating a person-specific detector for the person of interest by training a support vector machine classifier using at least one image of the person of interest as positive training data and the records of the detected moving persons in plurality of frames of comparison video data as negative training data; and applying the person-specific detector to a plurality of records from video data of interest to identify one or more records as candidate matches to the person of interest.