Trail Effect in Sony Vegas?

[Steve Rhoden]

The native filters that comes with Vegas don’t have anything like that,
a plugin that comes to mind that can create such an effect along with
many others is Pixelan SpiceMaster, you can download a trial and test
things out yourself. https://pixelan.com/sm25/intro.htm

Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
https://www.facebook.com/FilmexCreativeMedia

[Aleksey Tarasov]

Several tracks with the same event with 50% opacity + shifted by 1-2 frames

[Liam Zba]

Kind of works, but in the video the trail stays at 100% opacity.