List of best mirrors for IP address 3.15.229.15, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/raspbian/pool/main/o/opencv/libopencv-viz-dev_4.6.0+dfsg-14+rpi1+b3_armhf.deb