How to setup context sharing between GPUImage and cocos2d to capture gameplay video

How to setup context sharing between GPUImage and cocos2d to capture
gameplay video

I'd like to capture video from cocos2d gameplay in my app. I can just
simply use glReadPixels, but it's very slow. I found out that
GPUImage/GPUImageMovieWriter uses more advanced approach, but I have to
setup context sharing between GPUImage and cocos2d
Anybody knows how to make that?
I've tried to push GPUImage's sharegroup into cocos2d, but I have no luck:
container = [CCGLView viewWithFrame:CGRectMake(116, 37, 480, 640)
pixelFormat:kEAGLColorFormatRGB565 depthFormat:0 preserveBackbuffer:NO
sharegroup:[[[GPUImageContext sharedImageProcessingContext] context]
sharegroup] multiSampling:NO numberOfSamples:0];
Any help would be appreciated.