Hello i am an absolute beginner. I want to creat a Training app for Emergency medicine
Text and Pictures are no Problem.
But i need to use many Training videos from Google drive so the user can watch them as Tutorials
to a specific topic.
I would download the video first before trying to play it, Google Drive is fussy about streaming video. Also you may have issues if your videos are over a certain size, because google drive will throw up a popup (which you will not see if using the web component) and prevent the download. Best if you can keep videos under 5mb?
So a video with a maximum of 1-2 minutes in VGA resolution (640×480) with the lowest possible bit rate. I'm afraid you can't expect anyone to watch videos like that these days. 
Alternatively, upload all your videos to youtube and stream them from there. (This is what youtube is for )