A quick'n dirty reproduction of the Yahoo! Weather animated blurred background image. Requires GPUImage and AHEasing. Note that this is mostly an experiment and has several rough edges! To use it, create an instance and set it as a UITableView's backgroundView. You also need to provide the UITableView to the ASMBlurredImageBackgroundView.

ASMBlurredImageBackgroundView.h

//
//  ASMBlurredImageBackgroundView.h
//  Created by Andy Molloy on 4/19/13.
//
//

#import <UIKit/UIKit.h>

@interface ASMBlurredImageBackgroundView : UIView
@property (nonatomic, assign) double constant;
@property (nonatomic, assign) double factor;
@property (nonatomic, assign) double max;
@property (nonatomic, assign) double min;
@property (nonatomic, weak) UITableView* tableView;

-(void)setImage:(UIImage*)image;

@end

ASMBlurredImageBackgroundView.m

//
//  ASMBlurredImageBackgroundView.m
//  Created by Andy Molloy on 4/19/13.
//
//

#import "ASMBlurredImageBackgroundView.h"

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wnewline-eof"
#import "GPUImage.h"
#import "easing.h"
#pragma clang diagnostic pop

@interface ASMBlurredImageBackgroundView ()
@property (nonatomic, strong) GPUImagePicture* picture;
@property (nonatomic, strong) GPUImageView* imageView;
@property (nonatomic, strong) GPUImageFastBlurFilter* blurFilter;
@property (nonatomic, strong) GPUImageTransformFilter* transformFilter;
@property (nonatomic, strong) GPUImageGammaFilter* gammaFilter;
@end

@implementation ASMBlurredImageBackgroundView

-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
  		self.imageView = [[GPUImageView alloc] initWithFrame:self.bounds];
  		[self addSubview:self.imageView];
  		
  		self.max = 3;
  		self.min = 0;
  		self.constant = 0;
  		self.factor = 0.01;
  	}
    return self;
}

-(void)setTableView:(UITableView *)tableView
{
	[_tableView removeObserver:self
				        	forKeyPath:@"contentOffset"];
	_tableView = tableView;
	[_tableView addObserver:self
			      	 forKeyPath:@"contentOffset"
			        		options:0
			        		context:nil];
}

-(void)setImage:(UIImage *)image
{
	self.picture = [[GPUImagePicture alloc] initWithImage:image];
	
	self.blurFilter = [[GPUImageFastBlurFilter alloc] init];
	[self.picture addTarget:self.blurFilter];
	
	self.transformFilter = [[GPUImageTransformFilter alloc] init];
	[self.blurFilter addTarget:self.transformFilter];
	
	self.gammaFilter = [[GPUImageGammaFilter alloc] init];
	[self.transformFilter addTarget:self.gammaFilter];
	
	[self.gammaFilter addTarget:self.imageView];
}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
	double vv = self.tableView.contentOffset.y;
	vv = vv * self.factor + self.constant;
	vv = MAX(self.min, MIN(self.max, vv));

	self.blurFilter.blurSize = vv;
	
	const CGFloat shiftDist = 40;

	CGFloat scale = (self.picture.outputImageSize.width + shiftDist) / self.picture.outputImageSize.width;
	CGAffineTransform scaleTransform = CGAffineTransformMakeScale(scale, scale);
	
	float mv = (self.tableView.contentOffset.y * 0.1f) / shiftDist;
	mv = MIN(1, MAX(0, mv));
	mv = QuarticEaseOut(mv);
	mv*= shiftDist / self.picture.outputImageSize.width;
	
	CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -mv);
	
	self.transformFilter.affineTransform = CGAffineTransformConcat(translateTransform, scaleTransform);

	self.gammaFilter.gamma = 1 + (vv * 0.25f);
	
	[self.picture processImage];
}

@end

SampleUsage.m

ASMBlurredImageBackgroundView* backgroundImageView = [[ASMBlurredImageBackgroundView alloc] initWithFrame:self.view.bounds];
[backgroundImageView setImage:[UIImage imageNamed:@"TestImage"]];
backgroundImageView.tableView = self.tableView;
self.tableView.backgroundView = backgroundImageView;