Pay Per Request in Django
You can do everything web with Django just like with any other webframework/weblibrary.
Probably the easiest way would be to have a user-profile, and as soon as the payment has been working out you add this video to the users "allowed" list. This makes it quite easy to show the users available videos.
The redirection thing after payment really depends on your provider, paypal and others allow you to embed their payment process into your application, and have powerful APIs to check for "incoming" payments.
Is it possible to implement this in django: In a video site, for every video a user want to watch he/she must pay a fee before watching the video. If it's possible, what's the best way to implement this. And after every successful payment, how can the user be redirected back to the particular video he paid for?