Allow Only youtube in one subnet and all the internet in the other

I am planning to start a free youtube only hotspot in my locality.I have multiple networks on my router.I want to allow only youtube.com i have the two ip blocks that I want to allow i.e., 216.x.xxx.xx/19 and my ISP’s GGC 202.78.242.xx/24.How do I do that without web proxy?