Incorporating CUDA API in prebuilt compiled Opencv ecc.cpp code

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I'm using NVIDIA Jetson TX1 with cuda version 8. A sample code with cuda::warpPerspective() alone works properly. But when I incorporate cuda::warpperspective() inside ecc.cpp and enter "make -j7" from /opencv-3.3.1/build/, errors occurs.

oh, you're trying to modify the opencv library code ? you have to rebuild the opencv libs then. also you have to add the resp. cuda dependancy lib to the CmakeLists.txt for the lib, ecc.cpp is in (no idea, which it is)

undefined reference error is now gone by executing cmake once again. Now following errors occurs. error: ‘threadIdx’ was not declared in this scope const uint tid = (threadIdx.z * blockDim.y + threadIdx.y) * blockDim.x + threadIdx.x; error: ‘blockDim’ was not declared in this scope const uint tid = (threadIdx.z * blockDim.y + threadIdx.y) * blockDim.x + threadIdx.x;

sorry, but we can't solve anything without context