I don't think you can set the image stabilization settings in the stock app. For that reason I've switched to ICS Camera+ which looks exactly the same but allows you to turn on/off stabilization for both the video and photo.
On the GN the stabilization tends to give the video a more blurred look. So your video is "less shaky" but blurry. I'm much happier with the video when stabilization is off. The video is much cleaner.
there r many apps in playstore or u can try s4 camera patches.. however s4 has both software and hw stabilisation the cam on my nexus4 became much more stable than earlier... try them...