I don't think you could legally port Lazy Foo's tutorials.
Q: Can I port your code to Java/Perl/Python/C or translate your tutorials to another language?
A: No. From what I learned in my business law course, copyright law is sticky to say the least. If I do allow people to translate my tutorials who has rights to those translated tutorials is a complete mess. I'd rather just not deal with it.
P.S.: Yes, I know that because I had that idea too. But instead made my own set of tutorial examples: https://github.com/Vladar4/sdl2_nim/tree/master/examples (not for official sdl2 implementation though).
Well, It's totally your decision. I just wanted you to know of possible consequences regarding Lazy Foo's works.
Also, feel free to ask any sdl2-related questions if there'll be some incomprehension.