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The secure enclave is not used for bulk encryption and decryption, it is capable of encrypting its own secrets, but does not actually affect the speed of any benchmarks. The CPU is used for bulk encryption and ARMv8 ISA has special AES instructions, same as Intel. As for video encoder/decoder, Intel had QuickSync for 10 years now. Nothing that is unique for Apple.

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I assumed the secure enclave was an encryption / decryption processor. But isn't QuickSync part of the Intel GPU - I thought hardware video encoding and decoding were done by the GPU?

Secure enclave is more akin to the TPM. It stores some secrets even the OS can’t access, including your fingerprint/face biometric. QuickSync is a dedicated hardware on the SoC die, not part of the GPU, but even if it were, it is just semantics if it is still on the same die.

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