The main approach seems to be:
[FEN "r3k1nr/pppqn2p/5p2/b5p1/3PP3/1BP2QBP/PP1N2P1/R3K2R w KQkq - 3 14"]
1. Nc4 Bb6 2. Ne5 fxe5 (2... Qd6 3. Nf7 Qc6 4. O-O f5 5. Nxh8 O-O-O 6. Nf7 Rf8 7. Nxg5 Nf6 8. Rae1 a5 9. exf5 Qxf3 10. Rxf3) 3. Bf7+ Kd8 4. Bxe5 Nh6 5. Bxh8 Nxf7 6. Qxf7 Qe8 7. Qxh7
At the end, White has the following major advantages:
- Up a rook and 3 pawns for a knight. Roughly +5.
- A candidate passed pawn (e4) in a connected pair.
- Black king cannot castle and is stuck in the middle (high king-danger).
The second factor can often be used to force the opponent to sacrifice a minor piece, which would result in a material advantage of a rook plus 2 pawns even ignoring all other advantages. In fact, the pawn at g5 is kind of dead, and so after a few more moves Stockfish sees the outcome as more or less like:
[FEN "r3k1nr/pppqn2p/5p2/b5p1/3PP3/1BP2QBP/PP1N2P1/R3K2R w KQkq - 3 14"]
1. Nc4 Bb6 2. Ne5 fxe5 3. Bf7+ Kd8 4. Bxe5 Nh6 5. Bxh8 Nxf7 6. Qxf7 Qe8 7. Qxh7 Qg6 8. Qxg6 Nxg6 9. O-O Ke8 10. Bf6 c5 11. d5 c4+ 12. Kh1 Bd8 13. Bxd8 Rxd8 14. Rf5 Rd6 15. Rxg5
The other main option for Black also leads to ruin:
[FEN "r3k1nr/pppqn2p/5p2/b5p1/3PP3/1BP2QBP/PP1N2P1/R3K2R w KQkq - 3 14"]
1. Nc4 Qb5 2. d5 O-O-O 3. O-O-O Kb8 4. d6 cxd6 5. Rxd6 Ka8 6. Rxd8+ Bxd8 7. Nd6 g4 (7... Qc6 8. Nf7 Bb6 9. Nxh8) 8. hxg4 Qg5+ 9. Kc2 Nh6 10. Bf4 Qxg4 11. Bxh6