Add new sample: Mirroring and recording video from camera stream

[stepancar]

• [x] I understand that issues created here are only relevant to the samples in this repo - not browser or SDK bugs
• [x] I have provided steps to reproduce
• [x] I have provided browser name and version
• [x] I have provided a link to the sample here or a modified version thereof

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Description

Hello! I want to add new sample which demonstrates mirroring video stream from camera and recording with media encoder. In that sample I want to highlight difference between processing video in main thread and in web worker.

This is a prototype https://stepancar.github.io/webrtc-samples/src/content/insertable-streams/video-recording/

Any concerns?

[crizmo]

Thanks !!

[stepancar]

Hello @fippo!

I noticed you are reviewing, merging PRs in this repo, I tried to follow contribution guide to contribute to samples, but didn't get any feedback. Created this thread https://groups.google.com/g/discuss-webrtc/c/Z-_Pwbm9xP0/m/BwA0d-1sBgAJ but didn't get any feedback there too This issue has an attached PR. Could you please validate the idea, and implementation if the idea makes sense?

Thank you!