Sorry for stating misinformation, actually you can bring a background plate as matte clip and layer with the original in the node editor, so there's no necessarily need for 2 video tracks. Is this new on Resolve 14, or have I missed this on 12.5?
And sorry for hijacking a Baselight thread, I just wanted to correct what I wrote earlier...
Baselight 5.0 RELEASED!
in Announcements
Been around for ages!