Moodle Plugins directory: Set: RecordRTC | Moodle.org
RecordRTC 
RecordRTC is a set of plugins for Moodle editors that enable users to add audio and video annotations to text, anywhere a text editor is present. The plugins add buttons for recording audio or video (with audio) to the editor toolbar. 
See more details in the Moodle RecordRTC documentation.
atto_recordrtc
Add audio and video annotations to text, anywhere an Atto text editor is present. This plugin adds buttons for recording audio or video (with audio) to the editor's toolbar. Using WebRTC technologies, all recording is done instantly in the browser. After recording, users can embed the annotation directly into the text they are currently editing. The recording will appear as an audio or video player in the published writing.
Latest release: 172 sites 36 downloads 26
tinymce_recordrtc
Add audio and video annotations to text, anywhere a TinyMCE text editor is present. This plugin adds buttons for recording audio or video (with audio) to the editor's toolbar. Using WebRTC technologies, all recording is done instantly in the browser. After recording, users can embed the annotation directly into the text they are currently editing. The recording will appear as an audio or video player in the published writing.
Latest release: 384 sites 43 downloads 16