Here?s how it works: First make sure that both you and your friend have the latest version of Messenger for either iOS or Android. Then, while both of you are viewing an open Messenger conversation, tap on the video icon in the top right corner to start sharing real-time video. Audio is off by default, but sound can be turned on if you choose. Your video will float over the active text conversation that you can continue while viewing the video. Your friend can watch your video stream and share a video back if they decide.