CGI has Come a LOOOOONG Way:

Literally everything in that video is fake.  Its all CGI.

Iranian Revolutionary Guard's Photoshop Brigade Hard at Work on Perfecting Qaher 313

That's a stock picture of the mountain in question.  It just strengthens the prevailing wisdom that the Qaher 313 is a joke.

One of the pix of the Bird of Prey when they were first released was a fake, to be fair, showing it flying in Nevada in daylight.  However, the BoP came from a credible source whereas the Qaher 313 is from one noted for faking.