how can i turn a photo into 3D character face?

Hello,
I was wondering if it’s possible to apply a picture of a human face at runtime as my character face (create real-time 3d-avatar).
I’ve done my research but I couldn’t figure out how to really do it.
Is there facility for such functionality within Unity?

(Please forgive my noobiness!)

Yes. Just load it in as a texture from your resources folder, and apply it to the material on your face mesh. Unity - Manual: Loading Resources at Runtime

it’s possible that Unity’s “UMA” system could help you, it would still be a lot of advanced work

as others have said, in the first instance very simply slap a texture (any image) on a shape, and learn how to use the texture offset and scale buttons, right there in the Inspector for the texture.

59266-screen-shot-2015-12-03-at-83748-am.png

Hope it helps you get started!