startCustomTrack()

// Start a custom track, let Daily generate the name
const trackName = await call.startCustomTrack({ track: customTrack });
console.log('Track started as:', trackName); // e.g. "customVideo0"

// Start with an explicit name
const trackName = await call.startCustomTrack({
  track: customTrack,
  trackName: 'cameraFeed2',
});

// Subscribe to all custom tracks from a participant
call.updateParticipant(sessionId, {
  setSubscribedTracks: { custom: true },
});

// Subscribe to a specific custom track
call.updateParticipant(sessionId, {
  setSubscribedTracks: { custom: { customVideo0: true } },
});