Sorry for double post, but it's actually light rays OR radial blur.
The effect is actually pretty simple. If you're masking it out, its a mask, copy the scene with the mask, paste the scene below and apply a glow to the bottom one. Then add radial blur(proportional) or light rays, and there you go. If you're doing the one at :17, it's just cookie cutter instead of a mask. Put a glow on bottom then apply radial/light rays.
