Syrian opposition accuses Assad of new "chemical attack" again, and even provides "video proof"

Opposition activists again accused President Bashar al-Assad's forces of using poison gas in Syria's civil war on Thursday, showing footage of an apparently unconscious man lying on a bed and being treated by medics. The alleged attack on the neighbourhood of Jobar in the capital Damascus comes a week after the Syrian government sent a letter to the United Nations claiming it had evidence that rebel groups were planning a toxic gas attack in the same area.

https://www.youtube.com/watch?v=COU_mm4Ogu4
There is no official confirmation of footage authenticity.