This is a slick and modern motion graphics animation. A tunnel forms from circle particles then explodes to a calmness in the middle before forming back into a tunnel again then the camera travels in as the tunnel then implodes.
This is the Blue/Grey On black background with glows added version. Other colour variations available with apha channel transparent background, or you could alter the hue, colour balance etc yourself easily.
I'm a 3D Artist / Animator / Motion designer, that works on a range of work from broadcast design to character animation and have worked for many clients such as Twitter, BBC, Cartoon Network mainly in the UK but can work for clients based anywhere in the world.