Update coming soon.

Screenshots of Triggered Actions in Cinematics Editor

And:

Old Video Tutorial for Cinematics Editor

This is an older tutorial video, for v0.9.3 (Beta 3.3), and much has been improved with the Cinematics Editor since then, however it may still be helpful.

The following video tutorial introduces you to the new camera keying controls in beta 3.3. These controls allow you to set up camera paths to use in your in-game cinematics.
 

Please allow the tutorial a few seconds to load up.