Yes. Co-applicant can be added while taking a home loan. If co-applicant also has some income, it can help increase the eligibility of the loan. In fact, most Banks/NBFCs today insist on having a co-applicant while applying for the home loan.
It is not mandatory that co-applicant needs to be a co-owner in the property. However it is mandatory for co-owner to join as co-applicant for the loan