Screencast-O-Matic is currently offering a public beta of their Chrome app. To use Screencast-O-Matic on your Chromebook you will need to go to this page while on your Chromebook, click launch recorder, install the Chrome app when prompted, and then start recording your screen.
Screencast-O-Matic on a Chromebook will let you record for up to fifteen minutes per video. You can include your own narration as well as sounds from your Chromebook in your screencasts. Completed videos can be saved to Chromebook or saved directly to Google Drive.
If you're not up for trying a beta product on your Chromebook, you can use one of these six other ways to create screencast videos on your Chromebook.
