In this After Effects Tutorial VideoFort Jon give a quickoverview on how to use the Roto Brush. With your footage imported into a new comp, select the roto brush tool at the top (next to the puppet pin tool). Go into the footage layer and draw a line down the subject you want to roto.
Now you can scrub through and adjust the Roto mask as needed by adding or subtracting from the roto mask. To subtract from the roto mask simply hold down the option key and select the portion you want subtracted. What cool effects videos do you create? Post them in the comments below! Be sure to Like, Subscribe and head to http://www.VideoFort.com to use amazing videos for your projects!