Just a few suggestions:
Rather than using a browser, download the Zoom app, which is available for most platforms.
If you go to the Zoom website, join one of their 'Test Meetings' and see if you get a video link working.
Unfortunately the Zoom support function does not appear to have a suggestion regarding this particular problem. It would seem that you can only test your own video output and incoming audio.
Do you have similar problems using your other devices, Ipad, mobile phones etc.; you can try this out by setting up a meeting between all your own devices. Don't have them too close together if the Audio is on, you will get terrible feedback. If it is just the laptop, check that the user profiles have been set up the same.
Does the laptop meet the minimum specification requirements set by Zoom?