The video shows a person using a syringe to inject a substance into the mouth of a cat. The cat is lying on a table, and the person is wearing gloves. The cat's mouth is open, and the person is carefully injecting the substance into the cat's mouth. The cat seems to be calm and cooperative during the process. The person's movements are precise and gentle, indicating that they are likely a veterinarian or a trained professional. The video provides a close-up view of the injection process, allowing viewers to see the details of the procedure.