Example notebook for optimizing number of frames as described in issue #376

[aitaten]

This is a notebook optimizing the number of frames for different lead-times for the Optical Flow (Lucas-Kanade) motion vector computation. The exampls is related to issue #376 but I think the second example commented in that issue should be also added.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.74%. Comparing base (fc446bc) to head (3f0c4ed).
⚠️ Report is 78 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   83.47%   83.74%   +0.27%     
==========================================
  Files         161      159       -2     
  Lines       12536    12724     +188     
==========================================
+ Hits        10464    10656     +192     
+ Misses       2072     2068       -4     

Flag	Coverage Δ
unit_tests	83.74% <ø> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[dnerini]

Thanks @aitaten , this is looking very good! I will have a closer look, but I was wondering if it wouldn't be better to split this PR into two? Here I would rather keep the tuning tutorial, while the second should be about the INCA motion field -- by the way, I'm not sure why this is implemented in the example only, shouldn't we have it as an additional method in the motion module?

[aitaten]

Thanks @dnerini for the review. Including the other example was a mistake so I have removed the unwanted file from the PR (addressed in commit 3f0c4ed). Sorry about that.

I will do, as we talk, a separated PR and branch about the INCA motion field/TREC-like.

[dnerini]

(I'm working on this, sorry, just going very slow...)