I am new to Zoom. I plan to use the service of video chatting during the meeting on an ANDROID application. I notice not everything can be customize after the meeting started. For example, I want to remove the “change camera option” & “mute the speaker” option, currently is not able to do that. Besides, I don’t want another view that can show both same size of myself and the other person. Moreover, I want to have callback when someone join the meeting/leave the meeting. That is not possible too. Please advice.