Thanks for getting back to me and thanks for the link. I am a bit confused though. The Youtube video that I am linking to in Elementor is a 16:9 aspect ratio so it shouldn’t need to be stretched or resized.
Could you explain why there are only the black bars in lightbox and not when playing through Youtube? It seems to be a wider than 16:9 aspect ratio in light box when playing a 16:9 video.