Hello,
I would like to know how you insert a vimeo video such as you put an example in the travelify demo https://colorlib.com/travelify/blog-full-content/
Do we have to put a special plugin ?
Thanks for your answer.
You mean how I have added Vimeo videos on blog page or how I have got them inside content?
In blog page (not single post view) it will be displayed only if you use Blog Full Content Display Blog template. You can read more about on theme documentation.
Video in regular blog posts can be embedded by simply copy/pasting video URL on a new line and WordPress will convert it into embedded media. Read more about it on WordPress documentation.
When editing your blog post your video will look like a single URL like this