A single-sentence summary:
Terms like "HD" or "Mosaic" refer to the visual resolution and editing style of the video.
If you intended to write an article or academic piece, you might consider reframing the string into a proper subject, such as:
Using the ENMOSAIC algorithm, Leena began decoding the tiles. The first revelation was a series of coordinates: —the location of the old municipal archive itself. Hidden beneath the basement floor, a sealed vault was indicated.