The best videos to learn MassTransit are in the Live Coding section. These are the most up-to-date videos detailing how to build applications using MassTransit.
Beyond those videos, there are several other video presentations featuring MassTransit.
Event Driven Architecture Presented at the North Dallas .NET User Group in February, 2010 by Chris Patterson.
Loosely coupled applications with MassTransit and RabbitMq Presented at NDC Oslo 2016 by Roland Guijt (he is also the author of the MassTransit Intro course on Pluralsight)
Messaging with MassTransit (Lightning Talk) Presented at the dotnetsheff User Group in March, 2018 by Kevin Smith.
Others I'm sure, I just need to find them and link them here.