If you took a video and for what ever reason it is now up-side-down, there are many ways to fix this some every hard and one that is easy.
You can do this with any video editor. The Microsoft Movie Maker, Kdenlive, or most any movie editor will do. The problem is the edited video has to be rendered which can take a very long time with low powered computers. Video rendering is one of computing’s most difficult task. It requires a fast processor and a powerful video co-processor to do it in a reasonable amount of time. If you you have a powerful computer no problem.
The easy lay to do this is to let the massive resources of the cloud do it for you. Upload your video to RotateMyVideo.net and let their massive processors rotate and render your video. This is quick and easy.