And is there also an automatic way to show pictures in fullscreen, when getting to the page?
Thanks for help
Auto-play may be possible, but you should be aware that Chrome and FireFox now have functions that allows users to block auto-play videos. This is a reflection of how most users feel about this type of video. You should not assume that your video is going to be played automatically.
Your best approach will probably be to get your respondent’s cooperation and get them to willingly play your video at full screen. I don’t know what you can do, but this will probably be a more productive approach than trying to force it on them.