Related to #614 Change resolution for input Video (Test Ver)

Related to #614
- Add more options for Video Passthrough Setting, which will change the output video resolution.

It is just a test version. I will finish the whole function in the following week.
![default](https://cloud.githubusercontent.com/assets/5828044/4518433/e098dd04-4c8b-11e4-9422-781c8695115e.png)


Since this line has been edited, might as well [prefer `str.format`](http://freeseer.readthedocs.org/en/latest/contribute/developers/styleguide.html#custom-guidelines).