At the moment, we can have all videos on or off. But in a class with many students is not practical to have students videos on, as it takes bandwidth and also makes the page busy. But we need to have the presenter/teacher video on so students can have a better connection to the presenter. So one or more people that have permission should be able to have their own video on and enable (give permission ) to other people if needed. Now we have one button to give a user video/audio , but like other systems it should be two separated buttons, one for audio and one for video.