National Identity Card for Overseas Pakistanis (NICOP) is a registration document issued to a eligible citizen of Pakistan who lives or has reference abroad.
Any citizen of Pakistan can apply for NICOP and can travel to Pakistan without requiring a visa in case of dual nationality. Please note that Passport number is a mandatory pre-requisite in case of applying for NICOP of new born babies if they are born abroad.
Document requirement can be find at the official website here. The same can be find in Urdu at this link