I face several problems in implementing this idea $($the object is removed instead of the background, or the two images are merged and the colors are strange$).$

I want to implement this in MATLAB:

$1-$ Take two images $($a images containing an object and a background$)$

$2-$ For the first image, I want to remove the background, not the object.

$3-$ For the second image, blur is applied to it

$4-$ The two images are combined harmoniously

Note: I would like a screenshot of the final output, please, with a detailed explanation