Fix video generation script

[sfmig]

• Plot individual ID next to bbox
  • right now, we plot the index of the individual in the position array
• Fix opencv window focus switch
• Factor out script to simplify
  • use visualisation module if possible
• Add argparser help
• Add tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.75%. Comparing base (5d58d85) to head (bd88753).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   47.75%   47.75%           
=======================================
  Files          24       24           
  Lines        1493     1493           
=======================================
  Hits          713      713           
  Misses        780      780           

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