On January 20, I gave a 60-minute talk to the "Cincinnati Java User's Group" about "How Should Java Developers Build Front-Ends for Web, Mobile, and Desktop Today?". There's no video, but the slides and links for getting started with Flutter are available.
Next March, I'll present "How should Java Developers build Front-Ends for Web, Mobile & Desktop today?" as an online talk at JavaLand 2021. That's Germany's biggest Java conference. It will be a hybrid on-site and online event.