A crowd of 1000 people for reception and 500 people for wedding can be simply covered two photographers and two video camera mans.If there are few more events going to happen at same time( like sangeeth) then you can hire one or more photographers accordingly.But if the crowd is going to be more than 3000 and if there is going to be more events at the same time then you can poet for 10 member crew to cover the whole event.