These are the organizations//Local governments whom you will interact for your tour, contact them and they will happily escort you out, can arrange tours for you as well. Call local embassy of Pakistan in Madrid and ask for General Information regarding Journalists. Carrying photography equipment will not be a problem, just take precautions while filming Women, Beard People, Military/Government installations, That’s it !
Hope it will help, further if you are going in March, then i can help you out in your project too. I will be in Pakistan from 8th March to 22 March.