In my application I want to fetch my gmail contacts. In my app I have already integrated \"Google+ API\" So i just need to know that can i access my gmail c
It is possible, but only if you ask for the contacts scope alongside your Google+ scopes.
Where you integrate the Google+ API, you will also need to ask for scope https://www.google.com/m8/feeds.
https://www.google.com/m8/feeds
See https://developers.google.com/google-apps/contacts/v3/ for more details.