Animation technique about to crack messy hair (5)

I believe the answer is:

mocap

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'animation technique' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'about to crack messy hair' is the wordplay.
'about' becomes 'ca' (circa).
'to crack' is an insertion indicator (inserted letters go into a gap or crack).
'messy hair' becomes 'mop' (I've seen this in another clue).
'ca' going inside 'mop' is 'MOCAP'.

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