GPUImage multiple video inputs with offset x and y

GPUImage multiple video inputs with offset x and y

I am trying to create an application with multiple videos playing at the
same time. The application uses different frames on which to record. The
problem is stitching those videos together using GPUImage library. I have
gone through
http://indieambitions.com/idevblogaday/mixing-videos-gpuimage/ and found
that it is possible to blend in two videos together into one using the
blend filter. My problem is that I want one video on top right and other
on bottom left both playing at the same time. I would also want to store
the resulting video for sharing. I have tried to look at other resources
like AVMutableComposition for writing it down but I will have to apply
filters to them later. So I was thinking of having a custom filter made
with multiple video sources that gives out the final video. This question
is for @Brad Larson specifically if he can give us some direction as to
how to do it.I have also attached an image of the output that I wanted out
of a filter/solution.