Reading the OpenGL ES 2.0 spec and available extensions there seem to be no way of processing vertices from one buffer into another. The extensions seem to target ES 3.0+ only. The best bet so far seem to be OpenCL with OpenGL interop...
Function may look like this where the enhancement improves quality based on camera properties over multiple frames:
vBufferIn=initial, vBufferOut=0
start
enhanceQuality(vBufferIn, vBufferOut) <--- Is there something like this in ES 2.0 with extentions?
renderUsing(vBufferOut)
...
swap(vBufferIn, vBufferOut)
goto start
Is there any way of having OpenGL ES 2.0 making vertex in/out processing?