UIImageView won't trigger TapGesture

@interface ScanViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (nonatomic, retain) IBOutlet UIImageView *resultImage;
@property (retain, nonatomic) IBOutlet UITextField *resultText;
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (strong, nonatomic) IBOutlet UIScrollView *scroller;
@property (strong, nonatomic) IBOutlet UIToolbar *ScanBar;
@property (strong, nonatomic) IBOutlet UIImageView *scanImage;

- (IBAction) scanButtonTapped;

@end


#import "ScanViewController.h"
#import "SearchResultsViewController.h"
#import "AppDelegate.h"

@interface ScanViewController ()

@property (nonatomic) float originalScrollerOffsetY;

- (void) keyboardWillShow: (NSNotification *) notification;
- (void) keyboardWillHide: (NSNotification *) notification;
- (void) dismissKeyboard: (id) sender;
- (void) startCamera: (id) sender;

@end

@implementation ScanViewController

@synthesize managedObjectContext = _managedObjectContext;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void) viewWillAppear:(BOOL)animated
{
    [self.tabBarController setHidesBottomBarWhenPushed:YES];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    //[self.view addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)]];
    self.managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
    //self.scroller.delegate = self;
    //self.resultText.delegate = self;
    [self.scanImage addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget: self action:@selector(startCamera)]];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark Camera Event Handling

- (void) startCamera: (id) sender
{
    NSLog(@"anything");
}