UIImagePicker is not showing - ios

Question

I am trying to implement a button over the default camera view that opens the photo library once taped. Right now I implemented a custom overlay view class that displays the button, however the UIImagePicker is not presented or is invisible (covered by multiple views).
CameraOverlayView.h
#import <UIKit/UIKit.h>
#interface CameraOverlayView : UIView <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{}
- (UIViewController *)viewController;
- (void) button1:(UIButton *)paramSender;
#end
CameraOverlayView.m
#import "CameraOverlayView.h"
#implementation CameraOverlayView
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
//clear the background color of the overlay
self.opaque = NO;
self.backgroundColor = [UIColor clearColor];
//add a simple button to the overview
//with no functionality at the moment
UIButton *button = [UIButton
buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self
action:#selector(button1:)
forControlEvents:UIControlEventTouchUpInside];
[button setTitle:#"Select" forState:UIControlStateNormal];
CGPoint buttonOffset = CGPointMake( ([[UIScreen mainScreen] bounds].size.width - button.frame.size.width) / 2, ([[UIScreen mainScreen] bounds].size.height - button.frame.size.height) / 2);
button.frame = CGRectMake(buttonOffset.x, buttonOffset.y, 400, 50);
[self addSubview:button];
}
return self;
}
- (void) button1:(UIButton *)paramSender{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self.viewController presentViewController:picker animated:YES completion:nil];
//debugging
NSLog(#"sup!");
}
//find the first responder to access the UIViewController
- (UIViewController *)viewController {
if ([self.nextResponder isKindOfClass:UIViewController.class])
return (UIViewController *)self.nextResponder;
else
return nil;
}
Note that when I run the code there are no errors and the "Select" button shows correctly. And when I tap the button it displays the NSLog message but no photo library opens. Does anyone know what's the problem here?
Thanks!