How to make a video presentation with the possibility to go to the next or the previous "video-slide"?
I recently saw this page:

https://hacks.mozilla.org/2014/08/building-interactive-html5-videos/

Basically it uses the track element within the video element to make clickable "skip points" in the video. Javascript and html5 (with video) are pretty much amazing these days and with a little bit of experimentation I am sure you can get what you want. (Like on skip event pause the video if playing etc.)

Here is the relevant code from that page modded to your needs:

  &lt;video width="480" height="204" poster="assets/sintel.jpg"&gt;
    &lt;source src="q1fx20VZ-kNspJqnJ.mp4" type="video/mp4"&gt;
    &lt;source src="q1fx20VZ-27m5HpIu.webm" type="video/webm"&gt;
    &lt;track src="assets/chapters.vtt" kind="chapters" default&gt;
  &lt;/video&gt;

  &lt;div id="bar"&gt;&lt;/div&gt;


&lt;script type="text/javascript"&gt;
  var v = document.querySelector("video");
  var t = document.querySelector("track");
  var b = document.querySelector("#bar");

  v.addEventListener('click',play,false);
  v.addEventListener('timeupdate',update,false);
  t.addEventListener('loaded',render,false); 
  t.addEventListener('load',render,false);

  function play() {
    if(v.paused) { v.play(); } else { v.pause(); }
  }

  function update() {
    var p = v.currentTime/v.duration*100;
    b.style.background = "linear-gradient(to right, #500 "+p+"%, #000 "+p+"%)";
  }

  function render() {
    var c = v.textTracks[0].cues;
    for (var i=0; i&lt;c.length; i++) {
      var s = document.createElement("span");
      s.innerHTML = c[i].text;
      s.setAttribute('data-start',c[i].startTime);
      s.style.width = ((c[i].endTime-c[i].startTime)/888*480-7)+'px';
      s.addEventListener("click",seek);
      b.appendChild(s);
    }
  }

  function seek(e) {
    v.currentTime = this.getAttribute('data-start');
    if(!v.paused) { v.pause(); }
  }

&lt;/script&gt;


The contents of the vtt file look like this:

WEBVTT

1
00:00:00.000 --&gt; 00:01:42.000
Opening credits

2
00:01:42.000 --&gt; 00:04:44.000
A dangerous quest

3
00:04:44.000 --&gt; 00:05:50.000
The attack

4
00:05:50.000 --&gt; 00:08:24.000
In pursuit

5
00:08:24.000 --&gt; 00:10:13.000
Cave Fight

6
00:10:13.000 --&gt; 00:12:24.000
Eye to eye

7
00:12:24.000 --&gt; 00:14:48.000
Ending Credits