I want to smooth curve animation of my camera like this video (its done in blender):


its a really nice technique for making smooth camera animations. is there any trick to do same thing in houdini ?

You have CHOP-s for that ,ABS any motion you can make ...
Just search CHOP HOUDINI CAMERA shake, motion and smooth

CHOPS are your friend
either get object transform using object CHOP or create Gamepad constraint if you have controller
then you can use Record CHOP to record your camera movement
and Filter CHOP to smooth it


or if you already have motion you just want to smooth, then you can also use Motion FX smooth, which will set up Filter CHOP network for you

Smooth is easy in filter chop. But gamepad cam in houdini is not as controllable as wasd keys + mouse in blender.