When you need to repair or extend your background (or remove your subject) Adobe Photohsop has an incredible tool called the Content Aware fill. However, if you don't know how to "train" it, you may end up with messy results. Follow Moovieboy in this tutorial to learn how best to use this technique.
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Music:
What True Self, Feels Bogus, Let's Watch Jason X by Chris Zabriskie is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://chriszabriskie.com/reappear/
Artist: http://chriszabriskie.com/