Pakistan Army combat uniform has changed over time , perhaps people who put it on as a disguise did not know and got it all wrong , through out the video what is clearly audible is the question "what were you doing here" , "why are you wearing the wardi(uniform)" and I could just about make out reference to "kapray" which is clothes
So the most likely scenario here is that these people were caught wearing uniforms as disguise and their disguise went all wrong.
Some of the accents of the people in video is like how residents of KPK speak urdu , some are speaking with a more regular accent . No matter the accent they are speaking in Urdu , that much is clear