Here's how to go about making this effect.
NOTE: These pictures are only examples from http://fxhome.com
Step 1: Add a GRADE OBJECT to the timeline. (MOST IMPORTANT) You CANNOT add GRADE to the orginal footage, you must drag it from the menu bar.
Step 2: Go to the options, and add a MASK -- FREEHAND.
Step 3: Draw on the desired corner where you want your burnt edge to go. Close the
SORT OF LIKE THIS PICTURE ABOVE BUT JUST ON THE CORNER, NOT THE WHOLE SIDE!
Anways... Then, go to the mask and click invert.
Turn the brightness down all the way.
There you go. Maybe adding some
You SHOULD get this effect.