At this moment, there's only a site wide setting that controls if a 'recording is ready' message is being sent to users.
I have proposed to make this setting a option to set for every BigBlueButton activity on your Moodle page.
Reason: sometimes, when you make a recording, you really want a message to be sent when the recording is finished and published. But there are also moments when this is not the case (for example when you have 2000 students in a course and the recording is just for archiving purposes)
If you would like this extra option, please vote for my tracker: MDL-84363