You are not able to use Chrome for Elmo any more. This is a Chrome issue and not a GradeCam issue.
Elmo will still allow you to use your Elmo with Firefox or Internet Explorer.
Do you have a video icon in the upper right of the browser bar that has an X on it that could be blocking the camera from connecting? Did you receive a yellow active permission bar that asked to be able to run GradeCam plugin and choose "always run"?