Muffler is a macOS menu bar app that lets you quickly mute the micrphone and/or video for Zoom and/or BlueJeans.
Download the latest release and open the app to run it.
On its first run/open, Muffler will ask permissions to send Apple Events and control the computer. These permissions are what allows Muffler to ask BlueJeans/Zoom to mute their mic/video.
For BlueJeans, Muffler briefly foregrounds the window, sends the “m” or “v” keystroke (corresponding to audio/video mute respectively), then switches back to the previously-foregrounded app.
For Zoom, Muffler invokes a click on the menu items for muting/unmuting or stopping/starting audio or video.
The app requires permission to control the user’s computer in order to send keystrokes and invoke menu clicking.