Just to clarify, the feature you are talking about on the quick capture bar of Screenshot Captor is the function to grab a screenshot from your webcam, which you can also trigger from the main Capture menu of Screenshot Captor (near the bottom).  It doesn't record video just brings up a preview window showing the webcam view and a button you can press to capture an image from it.  I can see how it would be a suprise if you triggered it not knowing what it did!

Thanks for the heads up, I'll contact support and figure out what's going on.