Hi @Amit Bhumbar ,
These training video not works in case of network restrictions or if you are connected with organization wifi or Internet please try with local data it will work fine.
Because there videos are not using Youtube player so due to network issue they throw error.
Please try with another network or with your personal data
for reference :
https://www.outsystems.com/forums/discussion/75662/course-video-not-playing/
cheers,
Jitendra