The first difficulty: the browser never asked about the camera
This is the commonest nude video chat fault and it doesn't look like what it is. You open the page, press the large button, and there is simply no picture. No prompt, no error, no explanation — a dead rectangle. Everybody concludes the site is broken.
- Look at the left end of the address bar. There is a padlock or a small icon there.
- Click it. It lists camera and microphone with whatever decision is currently stored for this address.
- If either says blocked, that is a decision you made at some point and forgot. Change it and reload.
- If the site isn't listed at all, the page hasn't asked yet, which means the fault is elsewhere and the next section applies.
The reason this is so confusing is the silence. A granted permission produces a prompt you remember. A blocked one produces nothing at all — no second chance to say yes, no message. So the most common complaint about any random chat is actually a decision the complainer made months earlier on a different site.