There are many, so here are links to videos and articles proving that the best are made here.
Sporting CP Videos
Some video's of the world's best in action.
Sporting CP Youth Academy
Top 10 Sporting Graduates
Road to Sporting Lisbon
Sporting Performance Lab
Sporting Academy - BBC Sport
Sporting FC Toronto
Sporting Articles
Prefer to read? Here's some articles on Sporting CP Academies.
Ranking the Best Youth Academies in World Football
Soccer’s 10 Best Youth Academies
Read Here
Sporting CP’s: Figo, Ronaldo & Fonte
Football Times: The Sporting CP Way
Read Here
NY Times: Lisbon Club’s Youth Academy Sets It Apart
Read Here