Does anyone has any tips on how to make this kind of effect?
I’m assuming is made with emitters but I played with textures, camera texture, facetracking texture and a lot of resources I thought could work but I can’t get it right. It seems simple but I don’t understand nor I found any tutorials about it
This is the link for the effect: https://www.instagram.com/ar/279068340155568
But I saw many others like it.
I appreciate if someone can help me
This is the texture distortion patch in the library. Just plug the two textures in and you’re done 
As Josh pointed out, these use the texture distortion patch. To animate them easily, make sure you have a tileable/repeatable texture and use a 2d Transform pack. This will allow you to animate the y position of the texture for example and have it scroll. (which is what I imagine is going on in that example)
Oh, yeah I was imagining it was just a texture, but you could do the same thing with a particle emitter. You just need to send it through a scene render pass to turn it into a regular texture. Then you can feed it into the distortion patch
thank you @josh_beckwith and @Boris but I’m still doing something wrong. If the texture fill the whole screen it catches the camera texture. But when I put in the emitter I have the camera texture distortion but in the particle size. I’m somewhere close and will eventually get it right, so thank you! As soon as I get it right I will give my feedback 
You’ll need to stamp out your particles into a flat texture by using a scene render pass. Then you put that result into the texture distortion “Texture” slot
