Thank you for your advice.
Rewiring would not be an option as I have 8 analog cameras wired home run inside the wall to the main unit in the basement.
I guess the only option is to use converter, very expensive option. The cheapest I found around $100
http://www.bhphotovideo.com/c/product/855375-REG/MuxLab_500111_500111_CCTV_IP_Econo.html
http://www.bhphotovideo.com/c/product/728077-REG/Veracity_VHW_HW_Highwire_Ethernet_over_Coax.html
Thanks