The structure—a long alphanumeric string followed by _source —is typical for:
Systems that store assets using hashes or UUIDs to prevent filename collisions. Contextual Possibilities 0h4kyz1vxvlrwdmh724z6_source.mp4
The filename appears to be a system-generated identifier commonly used by video processing or hosting platforms rather than a standard video from a specific research paper. 0h4kyz1vxvlrwdmh724z6_source.mp4