If I stream on twitch with facecam and play like casino or mw?
During the work time? Yeah sure…
During working hours or on the work computer: termination without notice
If you do this during your working hours (and possibly on the company computer), this is a reason for termination.
No, where are you thinking!
Your employment contract certainly says that you can squander at least two hours of 8 hours a day on company costs.