I just found something interesting that I wanted to share. The D-Link DCS-5222L HD Wireless N Pan/Tilt Network Camera has a Digital Input and Output connectors, built in SD card writer, PIR motion detection and sound detection.
Relevant pages 7, 47-53, 57, 59
I’m thinking this should be able to be tied into ST without too much difficulty, in that you should be able to trigger recording through ST events/apps using the Digital Input and possibly use the on-board sensors to trigger events using the Digital Output.
I believe that the one limitation would be that you wouldn’t be able to view the video feed in ST directly, but you might be able to receive snapshots as per this thread:
I’ll leave this one up to the resident brainiacs to see what they can come up with!