Move to offscreen canvas in setDesktopwithCameraSource

[bola-root]

ant-media/Ant-Media-Server#6803

[codecov]

Codecov Report

❌ Patch coverage is 53.12500% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.40%. Comparing base (545da81) to head (3c5eed1).
⚠️ Report is 193 commits behind head on master.

Files with missing lines	Patch %	Lines
src/main/js/media_manager.js	53.12%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
+ Coverage   65.14%   66.40%   +1.25%     
==========================================
  Files           8        8              
  Lines        1994     2000       +6     
==========================================
+ Hits         1299     1328      +29     
+ Misses        695      672      -23     

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