Make format of Video Processing demo variables consistent, and fix typo

[orosoman-dstl]

Just me being picky about spelling/consistency

[sdhiscocks]

You'll also need to updated ipynb and RST file, and update MD5 hash, in order for docs to build correctly. See #635 for example PR that's done this before.

[mharris-dstl]

Apologies, didn't see above comments.

[orosoman-dstl]

Hopefully now fixed. Some weird things have happened with the ipynb diff though, hopefully not important.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fa56a94) 93.24% compared to head (53e41ac) 93.24%.
Report is 58 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #953   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files         201      201           
  Lines       12617    12617           
  Branches     2589     2589           
=======================================
  Hits        11765    11765           
  Misses        602      602           
  Partials      250      250           

Flag	Coverage Δ
integration	66.62% <ø> (-0.02%)	⬇️
unittests	88.64% <ø> (ø)

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