To be able to use Vaam, you need to allow the camera, mic, and screen recording in your computer.
Chrome will ask for permissions the first time when you click on the extension. Click allow to enable the camera and microphone.
If you missed it you can do the following:
.1 by copy and pasting the link below
chrome://settings/content/siteDetails?site=chrome-extension%3A%2F%2Fmfnihmhpikbpioclaalnljadjbmbcppo%2F
2.
Go to your System preferences > Security and privacy and allow Google Chrome for your camera, microphone, and screen recording.