First, enter a Daily domain and room name. You can use my defaults, but you might make some new friends:
Optional, but recommended: Press this button to open that room in Daily Prebuilt in a new tab (so you can see the effects of what you're doing).
Click the "Load cameras" button to see all of your available
camera devices:
Next, select the camera device you want to use:
Then, click these buttons to start or stop the camera. If you stop the
camera during the call, the camera's light will turn off.
Finally, join the room:
You can change the "enabled" property of the camera track using these
buttons. Disabling a camera track makes its video unavailable to your
app, but it doesn't turn the camera off. This means the camera's light
stays on, and re-enabling the track is much faster, since you don't have
to wait for the camera to restart.
Take a look at the setupVideo() function in the page's source code to
see how to handle various MediaStreamTrack events from the camera. To
leave the room, close the tab or refresh the page to start over.