sorry for the delay.
You don’t need the files
supersized.shutter.css. You only need to load the file
bigvideo.css and you don’t need to change the css.
If you have saved the video in the folder img, you have to type the next code in the file
The video scripts have a lot of problems in mobile and tablet devices. In this cases, the template changes the video by an image. If you want this, you have to use the file
video.js, but if you don’t want this feature and loads the video in mobile and tablets devices, you have to use the other file