I need to remove the word "Samsung" from a monitor that is clearly visible in the frame behind my subject.

Plan is to set up two identical tracks, cut a bezier mask in upper track around the word, allowing me to see the track below.

I then offset the lower track to the right with track motion. This allows me to see the texture just to the left of the word. It will then match the upper track exactly.

The trouble is, no matter what I do, I get a hard black line around the mask. It looks like I cut a piece of paper and laid it on the background.

Inside the Pan/Crop masking controls, I have tried feathering in, out and both, but always get a black line (like a border).

Basically, I'm trying to blur out an offending trademark, like you see all the time on TV.

How do I make a smoothly fuzzy hole through which I can see the same video below, except it is offset a bit?

Hope this makes sense.

Thanks.