Chrome Version: M60
OS: Windows

reduced test case : https://webrtc.github.io/samples/src/content/getusermedia/gum

What steps will reproduce the problem?
(1) Visit  https://webrtc.github.io/samples/src/content/getusermedia/gum/
(2)
(3)

What is the expected result?
M55 - https://drive.google.com/file/d/0B7hB1OPK6EuPUURHZEMyT3k1ZjA/view

What happens instead?
M60 - https://drive.google.com/file/d/0B7hB1OPK6EuPT3U4S2dnS08wdkk/view


Forum
https://productforums.google.com/forum/#!topic/chrome/2Pa-K4jsjuY

Hey I've experienced this as well! Chrome 55, same site (literally the github page that is a demo for WebRTC) video does record. 
In chrome 60, video does not work. However audio still works.
I tried everything I could to make getUserMedia work with that version of chrome but it just does not work. It's absolutely the browser. I could make a video of it but it's incredibly easy to test. Just download chrome version 60 and go here: https://webrtc.github.io/samples/src/content/getusermedia/gum/
If your response is clear your cache, cookies or permissions, those are all inaccurate. That's a link to a static site that does a basic webrtc demo using a browser compatible adapter. The source code does not use cookies, your cache doesn't matter for a new site, and the permissions window comes up like it normally should.