You can use this:
func getMovie() {
    let selecionadorDeFoto = UIImagePickerController()
    selecionadorDeFoto.delegate = self
    selecionadorDeFoto.mediaTypes = [kUTTypeMovie as String]
    selecionadorDeFoto.allowsEditing = false
    selecionadorDeFoto.sourceType = .photoLibrary
    present(selecionadorDeFoto, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    // Your code here
}
6
solved Selecting Video from Camera Roll [closed]