if I translated and posted video tutorial youtube, I have violated the copyright of unity 3d or not ?

Questions & Answers
1

These tutorials unity no Vietnamese translation, if I can translate tutorials and posted on youtube without copyright infringement

2

There is a possibility of violating the original content creators license yes.

Two alternatives:

  1. Contact the content creator and see if they have an issue with it.
  2. Contribute to the already existing video by adding Closed Captions in your language.

Bottom line, ask the content creator if they care, they probably will.