partial decoding using GPU

I need only partial decoding or for that matter only bitstream processing till cabac/cavlc to be done in GPU … are the APIs available such that only certain part of overall decoding can be done in GPU … for e.g. in case of H264, the input will be a I/P/B frame and we want GPU to only handle bitstream with CABAC/CAVLC decoding without actually decoding the frame fully to the raw YUV level. Is this possible ?