[Enhance] Support Webcam inference in topdown/bottomup demo.

[Tau-J]

Motivation

• Support Webcam inference in topdown/bottomup demo.
• Support FastVisualizer to conduct efficient demo inference.

Modification

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[Ben-Louis]

Do you think it is necessary to ensure that the interfaces of FastVisualizer remain consistent with those of PoseLocalVisualizer, similar to the visualizers in other OpenMMLab repos?

[Tau-J]

Do you think it is necessary to ensure that the interfaces of FastVisualizer remain consistent with those of PoseLocalVisualizer, similar to the visualizers in other OpenMMLab repos?

That's necessary. But how about leaving this kind of stuff as the community assignment?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.03 🎉

Comparison is base (896e9d5) 82.25% compared to head (49763af) 82.29%.

❗ Current head 49763af differs from pull request most recent head 6227ab2. Consider uploading reports for the commit 6227ab2 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2244      +/-   ##
===========================================
+ Coverage    82.25%   82.29%   +0.03%     
===========================================
  Files          228      230       +2     
  Lines        13387    13552     +165     
  Branches      2268     2301      +33     
===========================================
+ Hits         11011    11152     +141     
- Misses        1862     1871       +9     
- Partials       514      529      +15     

Flag	Coverage Δ
unittests	82.29% <ø> (+0.03%)	⬆️

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see 22 files with indirect coverage changes

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[Ben-Louis]

That's necessary. But how about leaving this kind of stuff as the community assignment?

Sure, no problem