Yes, I've already bought pavilion theme and i'm wondering can I modify JCarousel somehow in source code or in administration to give him some widget zone to put him on the left side of blog posts gust like home page in pavilion.
if I understand correctly you are trying to copy the layout of the bestsellers/richblog area in Pavilion theme into another theme. Unfortunately this is not possible out of the box, but you can achieve it by implementing some custom modifications on your own.
First, the widget zone you are using for the carousel and the widget where the blog is rendered (on home page) should be "neighbor" elements in your source code (or just use the same widget for both). Also, it will be good if you wrap them together in a common parent, which will give you more flexibility when styling. The rest is only css styling.