No one verified the authentication of this video as far as I know, usually CIA and NSA does this for new material from AQ.
From break up of Pakistan to Bangladesh becoming virtual or rather real vassal state of India, under virtual Indian occupation today, there is one simple explanation, in one word, India (and their agents operating within our landmass). You can see this from the Indian posters interest in Bangladesh section of this forum. Many Indians are upset that some of us sitting in the west can bust their propaganda bubble, which they try to create with painstaking effort.
Indians failed to do this with Pakistan, but they succeeded in our landmass for various reasons, geography plays a big role, if you look at Bangladesh map and then there is incompetence of our so called leaders.
We know no one truly cares, or at least are not in a position to care. The countries you mentioned are all dealing with their own problems and some are too close to India to interfere. The West try to show that they care, but it is superficial. They need India for their pivot to Asia. And India on its part is playing a two faced game. They seem to take part in Pivot to Asia, the Western led anti-China alliance and then with China, they try to show Asian solidarity, so China does not treat India as enemy. The other problem with China is that its top leadership is corrupt to the core and not doing a good job to secure Chinese interest, specially in its immediate neighborhood, or may be they are waiting for a more appropriate time. When I look at the occasional disturbance in Xinjiang, it brings to mind that there are some forces who want to poison the mind of Chinese against Muslims to prevent a future possible Sino-Muslim alliance. Only China together with a more united Muslim world can balance the threat from India in Bangladesh in the future, when the West looses influence in this part of the world and India is left on its own without Western help and support for their ill deeds. What if happening in Afghanistan today, the US loosing and leaving and destroying Indian ill deeds there is a good model, we are hoping that something similar will happen to Indian interest in this region after the West is weakened sufficiently and China becomes much more powerful. Currently we have no choice but to wait for that future and suffer abuses from India and their agents in our country.