This morning, the news said the video may be a hoax. If it is, shame on those who perpetrated the hoax. If I was a family member of a passenger who perished in that crash, the pranksters would be meeting their Maker sooner rather than later.
From Bild’s website:
The authenticity oft the video is unquestionable, although the scenery on board is chaotic, totally blurred and no individuals can be identified.
http://www.bild.de/news/ausland/flug-4u9525/absturz-englische-version-40379746.bild.html