First of all authenticity of the video should be determined. Who knows these were Afghan people being beaten by indians in Pak uniform. These things can easily be staged. The source of this video is after all an afghan!
Second: whatever is published on BBC should be taken with a grain of salt. We are all aware of malicious campaign BBC has launched against Pakistan for so many years (which is obviously not a surprise, given the number of indians working there).
Third: Just for a moment if we consider this video to be authentic (which is very doubtful), AFAIK, talibans are being caught on the battleground with the help of local people (with 99% accuracy), so this is the MINIMUM treatment these animals should get, given the atrocities and terror they have unleashed on the innocent public.
Just imagine what would these very taliban, who are being beaten, would have done had they captured some citizen or soldier.
As I said before, I would LOVE to see Muslim Khan being interrogated the same way!