Starts the local participant's camera and microphone as part of the call loading process.
Invoking this method allows granular control over the participant onboarding flow. If you're looking to build a custom experience as the call loads, for example a "hair check" waiting room for meeting participants,
startCamera() will be useful.
If granular control is not required,
join() is often all that you need in order to load a call (it takes care of