Can I use "gem devise" and Michael Hartl rails tutorial authentication system together?

I have already finished Michael Hartl's rails tutorial and now I have a rails app which users can sign up with their informations.

I want to add "Sign up with Facebook and Twitter" feature to my app. But when I tried it just usage of omniauth, I have got some problems.

Now I want to try it with using "gem devise" and "gem omniauth" together for adding "Sign up with Facebook and Twitter" feature , without changing my authentication system.

Is it possible? I will be also grateful if you advice different methods for adding omniauth.

Thanks for your attention