The host can view their own media stream before changing the state to
ready and allow participants to enter. The host can specify audio and video devices by using the
selectAudioDevice() methods and call
liveEvent.setVideoViewForLiveEvent(videoView, hostId: hostId). When the devices are not specified, the screen will be black without any audio. Then, the host can establish a connection with the Sendbird server by calling the
startStreaming() method to see their own view.