I think what you'd need is something to sync with. That's what those clapper boards are for.
So - the video is also going to have an audio track. Try playing a couple hits on a kick drum, or three or four power chords when you start recording with the camera and Sonar. Do whatever you need to do in Sonar for audio processing, then Export your Sonar audio mix track. Bring it in to your video editor and look for the transients from the kick hits or power chords. Line those up, then mute the audio track from the video, then render the video.