Well of course I know how. He's me
ETTHEPEEPO:
How to (badly) extract reflections:
It’s not rocket science, but you need basic video editing knowledge, Blender works great (it's free), but any editor with layers will work.
-The camera MUST be completely still. Tiny movements break this.
-We're basically telling the software: "Here is a video with a reflection, and an image without one. Show me only what's different."
-Find a frame with little/no reflection and export it as an image.
-Import them, put the image directly above the video on your timeline. Stretch it to match the video's full length and alignment.
-Change the image's blend mode from "Alpha Over" to Difference or Substract. (They are very similar, try to see which one is better for your case)
-That is mostly it, however try changing the brightness and contrast of the image as it helps to make the diference clearer.
Hope this helps. Any questions on my profile, I don't want to spam this thread with something out of topic.