A bit old now, but the best Indy video I've seen is the extensive highlights of 2010 European Championship U14 final between Indy de Vroome and Siniakova
Protenis.cz is a great resource for junior videos, another recent interesting one is Bencic vs Komardina (part 1, part 2
The youtube channel for juniortennisru
has lots of videos of Russian juniors (obviously), but they some other European players as well. Some recent juniorteninsru videos for emerging talents are Kudermetova v Silich
, Suvrijn v Sorribes Tormo
This video from last year's Les Petits As showcases a lot of talent:
Also Colette (Zootennis
) is good for American players.