It’s the same process for a non-resident buyer as a resident buyer to get a mortgage in Canada. The main difference is signing the mortgage documents. Now some banks send you the documents to get notarized by a lawyer in your area.
Other Banks add a condition in the approval document that all borrowers must be at one of their Canadian branches to sign the mortgage documents at the closing date. This is something to be considered when adding a family member to the title as part of the assignment term. Is everyone able to be in Canada to sign the required mortgage documents?