Click Record to start the video recording. 

Note: The Cog Button must be clicked first to configure the recording prior to starting

A duration counter will begin next to the Start button as well as a dropped frame counter.

Dropped frames may indicate a computer performance issue, or merely as a side effect of using a different frame rate.

(For example of recording at 30fps from a 25fps source, 5 dropped frames will show up per second)