Cv, questions about your interest and prior roles on the application form and a video intro asking a question that can easily be found be looking through the cv or questions. Any company that needs a video to see what you look like before scrolling through your cv already knows what they are physically looking for and is an automatic red flag looking to build LinkedIn follows under the disguise of standard recruitment. If a company can ask you to record a video, connect on LinkedIn, answer application questions before even scrolling through your cv, run.