By applying object detection, you'll not.
But I’d like to highlight a few things first: If you’d like to remove previously built and installed OpenCV libraries, just search all files with names containing ‘opencv’ or ‘cv2’ and delete all of them. Installing opencv-3.4.6 on Jetson Nano using my script is straightforward. OpenCL with GPU gives the best result : 7.56 s (almost 18 times better than the baseline). Results are even better when using GPU, because this kind of device can launch much more thread simultaneously compared to the CPU (Multi-cores vs Many-cores). Note: We ran into problems using OpenCV’s GPU implementation of the DNN.The documentation indicates that it is tested only with Intel’s GPUs, so the code would switch you back to CPU, if you do not have an Intel GPU.
