The video is here, https://instagram.com/p/Bf8nM8OgV08/
The biggest mistake Pakistan did was to move the capital from Karachi to Islamabad.
Probably was a big factor in the secession (the jute profits went to build Islamabad), Punjabified/Pathanicised the country.
Muhajirs, sadly lost political control after that I think until Musharraf, who incidentally was Pakistan’s best leader. Again it was lawyers in Lahore who conspired against him.