skip to 3:05 as you can see it better.
i would like to know how such a thing is done. i was thinking trailer render, but not too sure. seams like something was done with the lighting
do you mean the violet colored one ?
well ,…you can create a mesh on runtime and add the right transparent textures and animate it, or you can use the particle System and add some dynamic lights to it. wich is in my opinion the better solution.
attach a particle system to your gameobject (ex: spaceship) and play with it settings and add your desired textures untill you reach the wanted effect (maybe a Cone Emitter with the right Angel settings will help here)… and add some point lights . then add some script to manage the light color or intensity depending on the particle system changes.
there are for sure more solutions to draw this effect.
maybe you can describe more about where you are facing problems while creating a similar effect ?, or it is just the general concept you are pointing at ?