If I understood You correctly - You would need to remove all parallax effects from site, and that is a lot of customization to do. Perhaps You should chose a template without parallax animations? Then placing static element like video or any other would be as easy as putting a module in right position.
Just to make sure I understand you. In the header position where they have all the effects on the slideshow, it would take a lot of customization to put video in that main space ?
When you say a lot of customization, can you be a little more specific ? I don't know to much about joomla or gavick templates. So I'm trying to find a specific way to remove all of the extra stuff from the header position and just put video playing in the background.
The way I would try to do it, is to place custom HTML module in "intro" module position - as first one, and disable current intro module. Then use custom html module to place video.
I want to put video in the portfolio. So when we go to "What we do" we see 6 items as a portfolio. Clicking on a image you go to a K2 article but I want to pop-up a video or go to an article where I can click the BIG image for showing a video.
Our NSP module will always use image, but if You would like to have a video in Your k2 article - You need to find a plugin to k2 to do that, or make changes in frontend and backend which is beyond our support.