There is an option in Preferences that enables Vegas to close media files when you open them in external applications for editing, and reopen them again when you switch to Vegas.
p.s. don’t use YouTube for that – it will kill the grain 🙂
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It is a part of Vegasaur extension and it is not free. You can create a mosaic manually, using Track Motion, but of course, it will take a lot more of your time.