Vkontakte api, what's wrong with video?

Question

In contact with

I'm trying to find the mp4 file for a video:

type: 'video',
video: {
id: 456242152,
owner_id: -91356225,
title: 'Kapobka (2016)',
duration: 5534,
description: '',
date: 1461921903,
views: 114126,
comments: 0,
photo_130: 'http://cs626519.v...78c/yFiAhonDOI4.jpg',
photo_320: 'http://cs626519.v...78a/a2nyD6qTlSc.jpg',
photo_800: 'http://cs626519.v...789/nZ-nHaxxiuA.jpg',
access_key: 'bd0ff6c856367ab7cc',
user_id: 362681121,
can_add: 1
}

https://api.vk.com/method/video.get?v=5.52&videos=...
video is not displayed. Writes {"response":{"count":0,"items":[]}}
Although the method works for other videos.
What's wrong with this video?

Answer 1

It is in a closed group. Either because of this, or we'll never know, because it's private.