That will give you a list of all Videos in that Library. How you select your subset is then up to you (e.g. display the file names in a list and let the user select them). Another approach would be to use a FileOpenPicker to let the user select videos one
by one.
What exactlly is confusing to you? The basic approach would be to enumerate the Video files and upon selection by the user you open that file and hand it to your video player. Once the video has finished you open the next one. So basically you only keep
a reference to the file in your playlist and open it once needed.
That will give you a list of all Videos in that Library. How you select your subset is then up to you (e.g. display the file names in a list and let the user select them). Another approach would be to use a FileOpenPicker to let the user select videos one
by one.