First of all Bigg Boss asked every one to gather in the living area and asked them to nominate one of the person among them self,  later on after the nomination Bigg Boss select the most nominated person Devender Singh as a captain for the week.  He was nominated by 8 house mate and the reason is same of all the nomination that is he is speaking very less and not trying to mix up with everybody. 

Who nominated whom?

Abbas Kajmi Nominates Ali
Sameer Soni Nominates Bunty
Seema Parihar Nominates Ali
Shweta Tiwari Nominates Ali
Ashmit Patel Nominates Bunty
Manoj Tiwari Nominates Bunty
Sara Khan Nominates Seema
Veena Malik Nominates Bunty
Rahul Bhatt Nominates Seema
Ali Salim Nominates Bunty
Sakshi Pradhan Nominates Bunty
Bunty Nominates Ali
Rishant Goswami Nominates Bunty
Aanchal Kumar Nominates Bunty

Power given to the captain:

He can directly nominate anyone
For the First week no one can nominate him.
He is only person to use the delight room