Hi...
If you are using the Windows version try rendering to Sequence Image PNG. This will give you a transparent background.
If you are using the Mac version then you can use the Pro Res 4444 Mov format. This will also give a transparent background.
Obviously don't include any kind of background objects in your scene. Just add the characters but no props or scenery objects that you don't want to appear in the video.
Peter
Forum Administrator
www.reallusion.com