IOS CLLocation manager returning zero speed - ios

Question

Hi I want to calculate speed within my camera view in XCODE8. The code does not generate error but my speed is returning zero. So I searched the link below :Self Location Manager Delegate error in Xcode 6. My code has two interface files, one for CvVideoCamera and one for ClLocationManager. I never had two interface files in my project, so I am not sure I am doing everything correctly. My code is below, Can you please tell me if something is wrong in my code architecture that causing me to get zero speed.
viewcontroller.h
#interface ViewController : UIViewController<CvVideoCameraDelegate>
#property (nonatomic, strong) CvVideoCamera* videoCamera;
…
#end
#interface LocationController : UIViewController <CLLocationManagerDelegate>
#property (strong, nonatomic) CLLocationManager*locationManager;
#end
viewcontroller.m
#import "ViewController.h"
int speed;
#interface LocationController() {
}
#end
#implementation LocationController
#synthesize locationManager;
- (void)viewDidLoad
{
[super viewDidLoad];
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager startUpdatingLocation];
self.locationManager.delegate = (id)self;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
CLLocation *loc = locations.lastObject;
loc = locations.lastObject;
speed = loc.speed * 2.236;
}
#end
#interface ViewController (){
….
}
#end
#implementation ViewController
#synthesize imageView;
#synthesize videoCamera
- (void)viewDidLoad
{
[super viewDidLoad];
self.videoCamera.delegate = self;
(void)processImage:(cv::Mat&)image {
NSLog(#"speed: %.d”, speed)}