You can choose a different default permission setting and manage exceptions in Content settings.
Click the Chrome menu Chrome menu on the browser toolbar.
Select Settings.
Click Show advanced settings.
In the "Privacy" section, click Content settings.
In the "Media" section:
Ask when a site requires access to your camera and microphone: Select this option if you want Chrome to alert you whenever a site requests access to your camera and microphone.
Do not allow sites to access your camera and microphone: Select this option to automatically deny any site requests to access your camera and microphone.
Click Manage exceptions to remove previously-granted permissions for specific sites.
Using a Chrome device at work or school? Your network administrator may set camera and microphone settings for you, in which case you can't change them here. Learn about using a managed Chrome device