Find a glossy black surface. Move lights and objects reflected in the gloss to make a pleasing pattern. Shoot it with a camera. Import the footage into AE and use a combination of one of the layer's blending modes and opacity to create a gloss on the video.
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You can also try generate-cc lightsweep or a white solid layer set as mode: soft light, with generate ramp set to radial. Then for sharpening, add a new adjustment layer with blur and sharpen-Unsharp and/or use curves to increase contrast. Glow or bloom lights and darks might work too, depending on the look you want.