Activate “background” layer by clicking on that. Now grab rectangular marquee tool from the tool panel or you can just press shift+M again and again until it comes. Now draw a rectangle in the middle area as shown below.
Now click on refine edge or you can press Ctrl+Alt+R/Cmd+Opt+R which in present in the option panel. Increase the feather to 107 pixels. If you are are working on smaller dimension image than adjust your feather between 30-70 pixels. Press OK. If you want to know more about refine edge then you may click here.
Now we need to duplicate our selection onto a new layer. To do this press ctrl+J/cmd+J. This layer will only contains that pixels that were selected using rectangular marquee tool.