Greek citizens have been protesting in front of the parliament building to show their opposition to the laws being passed in attempts to get the country less out of debt. 153 out of 300 members voted in favor of the "latest austerity measure." These "measures" include pension cuts and wage cuts, raising the retirement age to 67, and making it easier for employers to fire their staff.
The Greek people have every reason in the world to be upset, but the terrifying "urban warzone" scene they have created is only making everything that much worse.... hence the title of the video:

 "Greece faces civil war if it can't face bankruptcy"