How to remove the smudge off the mirror

I have this Footage and I’m having trouble removing the smudge off the mirror.
is there a way to remove it? please it would be a great help this is for my thesis. thank you

Footage: https://drive.google.com/open?id=1ZOknhgvFzlyzkqlLEo58qwDEBVj-I70d

Hi there,

This is a rotopaint linked to planar tracking fix. It will be tricky and time consuming. I have a nuke tutorial that shows that workflow, but what host are you using, I will see what I can show you? The Remove Tool isn’t going to be a good candidate here, it’s moving over too much organic motion.

Cheers,
Mary