First we see the munition arriving by truck
Here we see it loaded on the launcher, a tube launcher as predicted, on the back of a truck
The munition is then raised into firing position
Also note among the group men in red berets
Red berets are worn by members of the Syrian Republican Guard, also known as the Presidential Guard, as well as the military police.
Just to clarify, as it's confused some people, the August 21st CW attack was at night, but this video shows the munition being used by the government forces, something it has used several times before (see here), so while it might not be the CW attack, it shows the government using them. I also believe there's a high explosive version of this munition as well, as seen in Homs.
Nic Jenzen-Jones has more information on this munition on his blog.
Update I've just been contacted by the activists who filmed this, who said "This is fired from the areas to the east and north east of Al-Mezzeh Airport around Daraya."
Update Nic Jenzen-Jones highlights on his excellent blog post on these munitions a photograph from November showing a launcher he identifies as an Iranian Falaq-2 loaded with what could be the same munition. The earliest video of this type of munition is from January 2013.
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