Section 131F 1/2. Notwithstanding the provisions of subsection (a) of section ten of chapter two hundred and sixty-nine of the General Laws or any other law to the contrary, the carrying or possession of a firearm and blank ammunition therefor, during the course of any television, movie, stage or other similar theatrical production, by a person within such production, shall be authorized; provided, however, that such carrying or possession of such firearm shall be under the immediate supervision of a person licensed to carry firearms.