Rotoscoping

[Tero Ahlfors]

You can do this by using different mask modes like subtract. See more here: https://helpx.adobe.com/after-effects/using/alpha-channels-masks-mattes.html

[John Cuevas]

Duplicate the clip and remove the rotoscope from the bottom clip, then set the bottom clips track matte to “alpha invert”

Johnny Cuevas, Editor
Thinkck.com

“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.

[Ali raza Qadir]

Thank you very much John, it worked pretty well.