Can it be used to capture game play from a Steam account on an iMac?

My son plays games via his STEAM account and would like to capture game play when using these games. We are entirely Apple with an iMac (not ideal for gaming as there are no dedicated gaming controllers - only the tracker pad), but he loves STEAM. Can the Elgato be used on an iMac also?

Elgato Game Capture HD60

Elgato Game Capture HD60

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