Is it possible to merge both the 2 element below so that they work on a single page. What i mean is this should be the background of the page:
http://tympanus.net/Development/AnimatedResponsiveImageGrid/index3.html
and a slideout contact form can appear at the corner over the background:
http://www.building58.com/examples/tabSlideOut.html

Is it possible, how?

It is, but I think you should just follow the tutorials that explain how to do that (or download the full scripts and implement them). It's a bit much to explain here I'm afraid. Lucky for you, you already have one "tutorial" waiting for you there (http://www.building58.com/examples/tabSlideOut.html). For the other one.. I wouldn't even know where to start, I'd try Google ;). If you need any help while doing these tutorials or with implementing the scripts, I'll be glad to help, and I guess other people around here will be too.

Could you please re-phrase your question .... I dont seem to get it clearly