[danielweber]

You have the burden of evidence flipped. Contracts are valid unless found otherwise by law. There have been a variety of exceptions carved out from what's allowed in employee agreements over the years. The right to generate a portfolio of one's work history is not, yet, in that list of exceptions.

[antimagic]

As a programmer I don't make videos, I write source code. We're not talking about me waltzing off with the git repository, but of me videoing my software as it does what it does. I for one, after 20 years experience mind you, have never signed a contract explicitly forbidding me to make a video of the product that I worked on running. I think that most other programmers are in the same boat. Which means that for most programmers, unless you are aware of a specific legal protection afforded to viewing software in action, your advice is scaremongering, and not helpful.