Sure you can, what an issue to think about. Quite simple, you definitely can befriend even a wild cat. The most important thing is that you need to befriend them. This is essential.
You need to see the difference between a stray cat and a feral cat. They are quite different. The stray cat is a cat whom someone used to keep previously, like a former cat that has not got a home anymore; while a feral cat is totally wild, born in the wild nature. This type of cats varies from humans and cannot be adoptable as generally it is not adapted to people, its habitat is wild nature and not a cozy closed home, closed space. While stray cats can be befriended with some effort, feral cats will not get used to your presence.
