Thank you guys for any suggestions!
The MorphSvg plugin is the great tool and probably you convince me to join to GSAP Club. I will try to use it in my project together with the ModifiersPlugin.
As for a div inside an SVG, It could be inside the SVG because I want to use the same scale for the div, the path and the Fibonacci figure.
Up till now, I've found a solution for responsive of the div path but It does not satisfy me. It doesn't work smoothly and I haven't full control of the div by GSAP.
http://codepen.io/gtruskowski/pen/zZbmGG