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CloudReco is running after left the Camera view

I have two views,

first one is startView with a button only

second one is CloudReco View

 

I press the button to push CRParentViewController, scanning , recognizing well, 

now , i want to leave this camera view, i press back button to startview for close CloudReco function and its operation.

 

now , i am in Startview . after a while, a notification prompt shown Poor Camera Image is prompted. that means the CloudReco is still running.

 

how can i stop the cloudReco after i leave CRParentViewController ?