Before anyone rates this question negative, let me clarify that I have tried all the resources possible in last two weeks before posting this query. And also I've never done this stuff previously and I don't have someone to guide me anyhow currently and I just have a few months of experience in iOS.
Now, the query is, I'm trying to crop a face along the face edges using vision API. I've found little help from this URL https://github.com/artemnovichkov/iOS-11-by-Examples
Using which I'm also able to do what's already done in above link. i.e. marking along the edge of the face.
My goal is to crop only the face along the edges.
My final goal is to make a sketch (Something like:
or apply some filters on the cropped face. For more reference kindly search for bobble app on play store or app store. Any kind of help is appreciated.