[Enhance] add visualization tools

[cir7]

Motivation

[Enhance] add visualization tools

[codecov]

Codecov Report

Base: 76.65% // Head: 76.55% // Decreases project coverage by -0.09% ⚠️

Coverage data is based on head (38450a1) compared to base (166f447).
Patch coverage: 54.28% of modified lines in pull request are covered.

❗ Current head 38450a1 differs from pull request most recent head 01a5856. Consider uploading reports for the commit 01a5856 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2092      +/-   ##
===========================================
- Coverage    76.65%   76.55%   -0.10%     
===========================================
  Files          139      139              
  Lines         9964     9991      +27     
  Branches      1631     1635       +4     
===========================================
+ Hits          7638     7649      +11     
- Misses        1972     1987      +15     
- Partials       354      355       +1     

Flag	Coverage Δ
unittests	76.55% <54.28%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
mmaction/visualization/video_backend.py	66.03% <41.66%> (-22.54%)	⬇️
mmaction/structures/action_data_sample.py	76.74% <66.66%> (-1.64%)	⬇️
mmaction/models/heads/base.py	80.68% <100.00%> (+0.68%)	⬆️
mmaction/visualization/action_visualizer.py	67.64% <100.00%> (ø)

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