As an HR professional, I recommend searching for video clips on office etiquette from reputable sources like LinkedIn Learning, Udemy, or YouTube. You can filter the search results based on the specific topics you want to cover in your presentation, such as communication, professionalism, or workplace behavior. Additionally, consider reaching out to HR associations or training providers in your area for recommendations on high-quality training videos. Remember to preview the videos beforehand to ensure they align with your company's values and the cultural norms in Calcutta, India. Good luck with your presentation!