I recently came across the following videos on the youtube channel of the Getty Museum, both of which are well worth your time. The first is titled "The Icons of Saint Catherine's Monastery, Sinai, Egypt", and also shows a few scenes of the monastery's liturgical life and famous library. At the time of the iconoclast persecutions in the Byzantine Empire, Egypt had already been conquered by the Arabs; since it was outside the Empire, and in such a remote location in the desert, Saint Catherine's was untouched by iconoclasts, and preserves a very large number of the oldest and most famous Christian icons. (A project to catalog them has been going for decades.)
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The second is about the Limbourg brothers, the illustrators of perhaps the most famous liturgical manuscript in the world, the Très Riches Heures du Duc de Berry. Parts of the video are, inexplicably, in Dutch without subtitles; however, starting at 11:45, it offers a very interesting account of how the Limbourg brothers drew from their experience in other media to create such beautiful and richly detailed paintings on such small pages.
The same channel has a number of other videos on the production of medieval manuscripts, including one on the physical production of the manuscript and its binding, and another on medieval liturgical calendars.
