GPUImage之视频录制+自定义水印

公司的项目有视频录制的功能，要求能将自定义视图嵌入到视频中去，下面是效果：

IMG_1602.gif

左边进度环是自己定义的内容
代码如下：

///创建摄像头
    _videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset1280x720 cameraPosition:AVCaptureDevicePositionBack];
    _videoCamera.outputImageOrientation = [UIApplication sharedApplication].statusBarOrientation;

//添加时间戳水印和图片水印
    UIView *contentView = [[UIView alloc] initWithFrame:self.view.frame];
    contentView.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy年MM月dd日hh:mm:ss"];
    NSDate *currentDate = [NSDate date];
    NSString *timeString = [formatter stringFromDate:currentDate];
    UILabel *timestampLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 70, 300, 30)];
    timestampLabel.text = timeString;
    timestampLabel.textColor = [UIColor redColor];
    timestampLabel.font = [UIFont systemFontOfSize:20];
    [contentView addSubview:timestampLabel];
    
    _progressView = [[JCAnalysisCircleProgress alloc] initWithFrame:CGRectMake(10, 120, 100, 100)];
    _progressView.progressWidth = 15;
    _progressView.progressColor = [UIColor orangeColor];
    _progressView.trackColor = [UIColor whiteColor];
    [_progressView setProgress:.5 animated:YES];
    
    [contentView addSubview:_progressView];

///创建水印图形
    GPUImageUIElement *uiElement = [[GPUImageUIElement alloc] initWithView:contentView];

 ///创建滤镜
    _filter = [[GPUImageAlphaBlendFilter alloc] init];
    ((GPUImageAlphaBlendFilter*)_filter).mix = 1;
    _filterView = [[GPUImageView alloc] initWithFrame:self.view.frame];
    [self.view addSubview: _filterView];
    
    GPUImageFilter *videoFilter = [[GPUImageFilter alloc] init];
    [_videoCamera addTarget:videoFilter];
    [videoFilter addTarget:_filter];
    [uiElement addTarget:_filter];
    
    [_filter addTarget:_filterView];
    [_videoCamera startCameraCapture];
    
    ///刷新
    [videoFilter setFrameProcessingCompletionBlock:^(GPUImageOutput *output, CMTime time) {
        
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"yyyy年MM月dd日hh:mm:ss"];
        NSDate *currentDate = [NSDate date];
        NSString *timeString = [formatter stringFromDate:currentDate];
        timestampLabel.text = timeString;
        [uiElement update];
    }];

效果不是很好，自定义控件效果不行：
1，进度条的动画没了
2，比较模糊，达不到要求
希望看到的大神给条明路，感激不尽