Now this question should become redundant as maximum share certificates have been dematerialised and now if any certificates are held in Demat form, can now only be transferred to legal heirs on the demise of the holder. We had adequately warned the readers to get their shares dematerialised and now post 31 Mar 2019, you can get transmission and transposition only after the demise of the original holder.
Still to answer the said question, just approach the registrar of the company whose address can be found at NSEIndia or BSEIndia(dot) website or you can Google the information.
You will get the contact details of the Company Registrar / Company Secretary and ask them the question and they will be able to guide you with the documentation process to get the shares in the Demat format. Most probably an affidavit signed by a first-class magistrate along with the requisite forms which will be guided by the registrar will be required.
If ever you require the information for best share for intraday, then do not miss this link as it can add to your carry home income.