I've just received my new laptop (Asus Zenbook), and installed Ubuntu 17.10 on it.
I installed Chromium on it (Version 63.0.3239.132), but it could not access my webcam at all. I tried with appear.in, hangout, meet, and all the others, but the result is always the same : it doesn't ask me at all to allow any webcam. Even if I force it with the left "secured" button, it doesn't change anything. In appear.in, it says "We can't detect a camera. Try connecting a camera to join the conversation".
When I use other softwares, like Firefox or Cheese, it works just fine.
All the posts I found are to allow access to a detected camera, but I can't find anything to help chrome detecting the cam :)
The problem occurs with HTML5 based site, so it is not flash related.