Prezi is a proprietary software here.
seminar. Which one or something similar should I use to create something like Prezi-style zooming dia -presentation?
It should be possible to reproduce the canvas that holds the presentation content, e. g. with PGF/TikZ. However, I don't see any chance to implement the all-essential pan and zoom features: The output formats of LaTeX, PDF and DVI, are simply not built for such tasks. You'd need an external tool to implement these features, which doesn't exist to my knowledge and would take a considerable amount of time to develop (after all, there are very few alternative programs to produce presentations like the ones created with Prezi at all).
A glimmer of hope could be
You could put images, itemize environments etc. into zoom boxes, which you distribute on the page of a single-page document. A
There is also
Found via comment by @Ignasi on "How to create non linear presentation using beamer or prosper" question.