It is possible to add a Youtube video on your website by using the embed function on youtube.com. This will create a video player as shown below. The difference between using the embedded code from Youtube, as aposed to using the 'Responsive video' element or the 'Text & Media' element, is that you can exclude showing suggestions of other videos afterwards. (9.1.1)
Go to the Youtube website and find the video you wish to use. Below the video you click the Share (Dela) link under the video. (9.1.2)
Now click on the link Embed (Bädda in) to access the code used to insert the video clip on your website. (9.1.3)
If you need to adjust the width of the video, this can be done below the code field. After adjusting, copy the code. (9.1.4)
Now go to your TYPO3 website and add a new element. Select 'Plain HTML' under the tab 'Special elements'. (9.1.5)
In the 'General' tab you can see that the content element type 'HTML' is selected (1). You can also add the name (2) of the video, but it will be not visible on frontend.
Add the copied Embed code into the white field (3) as shown below, save and close. (9.1.6)