Comment 36 for bug 1224756

Both pulseaudio and the camera service processes are out-of-process from the app and therefore not themselves governed by app lifecycle. If app lifecycle made sure to stop recording of audio and/or video when the app is backgrounded, then a visual cue is arguably not required (see my note below). If recording is not stopping when the app is backgrounded, we need to let the user know (eg, like what we do with the dialer now). Either route is fine from a security perspective, however, allowing the continuation of recording in the background with a visual cue might provide more utility.

Note: I personally feel we should be giving a visual cue (even if its temporary (consider full screen app)) when any recording is happening-- this is subject for debate and needs design input.