user37199: I would like to know how to produce this effect, for example on 1. YouTube Livestream, 2. Zoom, or 3. Omegle meetings. Thank you for your thoughtful answers/comments in advance!
See this video:




One is the spot with the piano in his own room:




Another is like Synthesiagame https://synthesiagame.com/ on the screen during the Omegle meeting:




user38103: 
This is simply produce with a synthesia like software. (For example: https://www.piano-vfx.com/   ) Just record a MIDI-File and put some effects on it with this software.

For the first one: I can imagine that he makes a video like in 2., but rotates the whole video for a specific angle. Then he puts his piano right next to the camera so it is the same angle as the already rotated video. After, he puts everything together into one video. That means, the particles doesn't even exist in real life but only on screen.



37199: <p>I would like to know how to produce this effect, for example on 1. YouTube Livestream, 2. Zoom, or 3. Omegle meetings. Thank you for your <strong>thoughtful answers/comments</strong> in advance!</p>
<p>See this video:</p>
<p><div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/5ohIVoqSeUw?start=418"></iframe>
            </div></div></p>
<ol>
<li>One is the spot with the piano in his own room:</li>
</ol>
<p><a href="https://i.stack.imgur.com/SjIob.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SjIob.jpg" alt="enter image description here" /></a></p>
<p><a href="https://i.stack.imgur.com/Lru7a.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lru7a.jpg" alt="enter image description here" /></a></p>
<ol start="2">
<li>Another is like Synthesiagame <a href="https://synthesiagame.com/" rel="nofollow noreferrer">https://synthesiagame.com/</a> on the screen during the Omegle meeting:</li>
</ol>
<p><a href="https://i.stack.imgur.com/53yCr.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/53yCr.jpg" alt="enter image description here" /></a></p>
<p><a href="https://i.stack.imgur.com/DQNsa.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DQNsa.jpg" alt="enter image description here" /></a></p>
 38103: <ol start="2">
<li><p>This is simply produce with a synthesia like software. (For example: <a href="https://www.piano-vfx.com/" rel="nofollow noreferrer">https://www.piano-vfx.com/</a>   ) Just record a MIDI-File and put some effects on it with this software.</p>
</li>
<li><p>For the first one: I can imagine that he makes a video like in 2., but rotates the whole video for a specific angle. Then he puts his piano right next to the camera so it is the same angle as the already rotated video. After, he puts everything together into one video. That means, the particles doesn't even exist in real life but only on screen.</p>
</li>
</ol>
