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The images seem already aligned (the camera didn't move?). I will do the following:

1. subtract all images => you get a mask of nothing is moving
2. get the bounding box of all moving part (where user is)
3. for each bounding box: there is one image with the user and two images without. Copy the bounding box of the user (it's the image where subtraction is not "mostly" zero.
4. Invert your mask and copy any of the three image to the final image => aka copy the "background".

I have no prior of the quality attended... but try if there is no illumination changes on your scene, it should works.