I forgot one last important note while copying / pasting. You also have to call renderAtTime: on the destination renderer, else you will not actually render/display the billboard (in this case, v001DestinationRenderer)

Sorry for the confusion the code would be:
                [v001MixerRenderer renderAtTime:time arguments:nil];
mixerResult = [v001MixerRenderer valueForOutputKey:@"EffectOutput1" ofType:@"QCImage"];

[v001DestinationRenderer setValue:mixerResult forInputKey:@"DestinationInput1"];

                [v001DestinationRenderer renderAtTime:time arguments:nil];


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