ios - GPUImage multiple video inputs with offset x and y -

i trying create application multiple videos playing @ same time. application uses different frames on record. problem stitching videos using gpuimage library. have gone through http://indieambitions.com/idevblogaday/mixing-videos-gpuimage/ , found possible blend in 2 videos 1 using blend filter. problem want 1 video on top right , other on bottom left both playing @ same time. want store resulting video sharing. have tried @ other resources avmutablecomposition writing down have apply filters them later. thinking of having custom filter made multiple video sources gives out final video. question @brad larson if can give direction how it.i have attached image of output wanted out of filter/solution.

from output doesn't seem want mixing 2 videos. these 2 separate video streams, , can displayed using 2 different uiviews.

the video in your link blended using specific filter called gpuimagecolordodgeblendfilter. if read article thoroughly talks other gpu filters too, , process not differ once know filter should using. once know it, it's playing values (or none @ in case of color dodge filter).

read this if want become aware of blending modes , filters. gpuimage applies same , more filters more efficiency due use of opengl shaders.