Hello,
i need video tripod for 5d ii. I want something stable, lightweight and with good smoothness. Basic stuff. For weddings , interviews etc.

Anything for the price up to 700$ (600£) ?

Thank you!

Look at the Libec lines.

This has been recommended before and is what I'm saving up for.
Manfrotto Manfrotto 504HD Video Fluid Head & 535 3-Secti B&H

I just purchased an E-image 7050 set-up with a fluid head for $400 that works extremely well. See my post in this forum; it's a lot more tripod/head that I ever expected it would be for the price, easily matching the $1000 + Manfrotto head and legs I've got.
Very smooth pans and tilts, locks down quickly and is rock stable with my 11 pound camera and rails mounted.

Wayne, what Manfrotto system do you have and what camera are you using?

To the OP, I have a Libec DV22, $300 at BH, it's light, well made and is decent enough for my Panasonic GH2, which is smaller than your 5d. The DV22 is the model Libec recommends for a GH2, undoubtedly I could do better with more of a budget, but a lot of or most of the pricier tripods are no good for dslr shooters because dslr's are just too light. Personally I don't think the tripod world has caught up with the demands of the new hybrid cameras. So shop wisely, it's not easy to spend big on a DSLR tripod.