Hi Noel,
That's the one, I have just installed BIAB 2018 to a USB Drive and successfully rendered a lead sheet video using that Video tab and it works perfectly, and the file size is just under 3mb compared to the "Save as" method which generated a video of 97mb.

Here is a link to a YouTube video demonstrating how they do it

https://www.youtube.com/watch?v=xA1g77oX7lI