The information on the Wiki appears to be inaccurate.
I believe that the package libopencv4tegra_2.4.10 has two dependencies. First, it requires CUDA 6.5 which in turn requires L4T 21.X. The tegra accelerated version of 2.4.10 will not run under R19, as R19 does not support CUDA 6.5.
R19 has a version of the Opencv tegra accelerated library, libopencv4tegra_2.4.8, available through this web page: