New Delhi, Feb. 11 -- Videos of the night of Nancy Guthrie's disappearance, released by the FBI on Tuesday, could hold precious clues about the 84-year-old's suspected captors.

Analysis of the video by experts have already revealed several things, with some questioning the masked individual's firearms experience, and others pointing out that the calmness he exuded is likely indicative of a planned kidnapping carried out by someone with experience.

While efforts to trace the individual using facial recognition technology could face some hurdles, given that the infiltrator was wearing a mask, another technology could play a much more decisive role -- gait recognition.

"Along with facial recognition technology, there's gait recognition te...