YouTube OAuth login with hard coded user name and password

Question

I am developing an iPhone application. This app supports an feature where user can upload a video to YouTube account which is shared by all the app users.

When app receives upload request, it internally logs-in to the common YouTube account and uploads the video.

As per my understanding OAuth is the secure way to log-in to any site compared to non-Oauth. Since only app knows the user-name and password, login dialog (web-view with user-name and password fields) should not be prompted to the user.

Is there any mechanism available in GData framework that supports OAuth authentication without prompting the user for user-name and password (i.e OAuth authentication with hard-coded user name and password)?

EDIT: Since my app is the owner of common YouTube account, can I user 'Client Login' mechanism for login? Is OAuth is preferred for hiding app user's account credentials from the app?