My coolpad note 3 plus mobile back camera not working

Have the  same issue the camer app doesnt open. In my case both rear frint cameras are not responding. I have tried othrr apps also but nothing works. 

@Jerin lollipop stock rom install kar ke dekho muze bhi mashmallow rom me ye problem aa rhi h but lollipop stock me camera sahi kaam kar rha h....hopefully it's work in your case also