Hello,
You can change the video in the Template Manager under the Template Specific Tab. There are instructions for either adding your own video or an image overlay instead. The cross hatch overlay is part of the core CSS files of the Template located here:
Template.CSS - Line 350
.s5_header_overlay_yes #s5_header_overlay_inner1 {
background: rgba(0, 0, 0, 0) url("../images/s5_media_overlay.png") repeat scroll 0 0;
height: 100%;
}
Source files should be upload to either:
/images
or
templates/incline/images
The first one is the root directory and the second one is specific to Template images. Using either one will work fine and if you navigate to these files on the server you will see the vast majority of images on the site here.
Regards,