@m_hossameldine said:
Add/Create new movie
I can not find any API to add/create new movie by providing its data through my web app.
So is there any API available for that?

No, it is not possible to add/create Movie or TV Show using API.
And there are no plans to add this feature.

or is there any way to add new movie other than using the add new movie button in my account navigation bar?

There is no other method. Only through the Website interface.