I developed a chrome extension, i uploaded it to chrome store as well and made it private. Now for the live preview i am not sure how i can give live preview of chrome extension.
or just a video recording of the extension is sufficient ?
As far as I know, you cannot sell it at CC
Chrome extensions can be sold at CodeCanyon, and should go in Plugins > Miscellaneous.
Other authors who have sold extensions like this in the past simply provided screenshots. You don’t need to add a live preview.
Welcome to CodeCanyon by the way. 
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