An HD Keyhole Mask, transparent
by AdamStanislav - uploaded on July 6, 2016, 8:29 pm
A keyhole, the way I remember them from when they were still in common use. All smooth with no sharp corners! Export it to PNG with the dimensions of your 16:9 video project, such as 1920x1080 or 3840x2160, and use it as a peephole mask with your favorite video editor.
This is the transparent version of the mask.
Here’s an example of using it in a video editor: http://i63.tinypic.com/178dft.png