Hi @nalli
You need to check if there is libopencv_ts.so in your toolchain.
If there is no such lib. you can add the line (IMAGE_INSTALL:append = " opencv-apps opencv-samples python3-opencv ") to conf/local.conf and follow up the 4.5.12 How to build U-Boot and Kernel in standalone environment in i.MX Linux User's Guide to setup and install SDK.
Best regards
Harvey