The app we will be using for this purpose will be PhotoDirector.
Download the app and accept terms that shows up on start-up.
- Select edit from the home page and select the pic that you want to edit.
- Click on 'Removal' on the bottom bar and select the area that you want to remove.
- Click on apply button. App will replace selected area with a similar background.
Note: Free version allows 1 removal per day.