[mediacapture-transform] Spec examples do processing on main thread (#28)

youennf has just created a new issue for https://github.com/w3c/mediacapture-transform:

== Spec examples do processing on main thread ==
We should probably recommend the best way to do things in examples, which means doing media processing in workers.
This applies both in spec examples as well as examples in https://webrtc.github.io/samples.

Please view or discuss this issue at https://github.com/w3c/mediacapture-transform/issues/28 using your GitHub account


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