We cannot verify the video, except to say that, with graphic closeups of the brains shot over the pavement, it looks real. The hands of the bodies appear to be bound, and all the bodies (men) were wearing civilian clothing. At one point a man holds a sign that reads today's date.
The only problem - a different video, which sounds like it was taken by teenagers, was posted two days ago, and shows only five bodies. Here is the description:
GRAPHIC - Five more Syrian Sunni Arab victims of Assad's reign of terror in Damascus: Al-Bahdalieh, Nov 17th, '12 (Graphic)
Five males are found on waste ground in Al-Bahdalieh, having been stopped by an Alawite gang.
There are commonalities between the two videos. The video shot on the 17th appears to show the men to the far left of the frame (note the shirt colors and the red bag near the bodies - at the 23 second mark in the liveleaks video and the 51 second mark of the Youtube video). The Youtube video explains that the 8 new bodies (on the right) were in addition to the ones on the left, which were old:
Published on Nov 19, 2012 - Eight bodies were executed on the ground by firing squad in the Bahdalieh added to a group of bodies that are found almost daily in the region...