MIT is working on developing the theoretical and practical foundation for machine vision beyond the line of sight context.  In short, cameras that can see around goddamn corners.

The crew used three types of high-definition cameras, designed and built by Geoff Bell and operated by cameraman Michael Richards:

A remotely-operated trunk-cam, which could film while the elephants were on the move and could also be set down.

A remotely-operated tusk-cam, which was smaller than the trunk cam and could be carried by the elephants for much longer periods.

Log and rock cams - cameras disguised as logs or rocks - which could be set down either by an elephant or human crew member and were activated by motion sensors.