Here's an excellent video of tea harvest and tea manufacture from the Uji region of Japan.
You will travel from the countryside to the city, from the Uji river and tea fields to the factory. You will see traditional harvest by hand and machine harvesting of tea leaves.
Touring a large factory, you watch sincha (Japanese Sencha) tea leaves being cleaned, tossed, steamed, dried, rolled, dried again, rolled again, dried again, and stored in bales at low temperature and humidity.
You will also see the Tsuen tea shop, the oldest tea shop in Japan.
Here are links for two longer tea videos:
Matcha tea is made from specially selected, shaded tea leaves that are then ground into fine powder. It can take an hour of careful grinding to make 40 grams of matcha powder. This is the famous tea powder used in the Japanese Tea Ceremony.
You can see the special bamboo shading that is required to make matcha and gyokuro tea in Japan in this video:
In another video, you can visit a small family tea factory in Shizuoka, Japan. This is a charming video, and you share a cup of their tea with them at the end: