Make sure your webcam works properly before that online meeting.
Mywebcamtest.com is a detailed free test for your webcam or it can serve as a quick mirror. Please be sure to select the allow button for your Adobe Flash settings in order for our webcam test to work.
If your video does not appear after clicking allow on the prompt your webcam may be having some connectivity issues.
If you are still not seeing yourself we recommend closing and re-opening your browser.