I think that would be very hard to do given the wall panels dark color darker seams and the white post.
Some things you would like to do in Photoshop will not be possible.
You might be able to remove the panel seams and change its color. You are not going to separate the veil from the background. The wall is behind the veil the you want to keep its not masking out the wall. you can see the wall through the veil