APL (Dyalog Unicode), 12 bytes

0∘{⍵∇⍨⎕←⍺⌷⍵} 

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0-indexed, takes input as the right argument.

0∘{⍵∇⍨⎕←⍺⌷⍵} 0∘  take 0 as initial left argument   ⎕←⍺⌷⍵ print element at left arg ⍵∇⍨ ⍺⌷⍵ recursive call with the input and new left arg 

APL (Dyalog Unicode), ¹² 11 bytes

{⍺∇⎕←⍵⌷⍺}∘0 

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0-indexed, takes input as the left argument.

-1 byte from user.

{⍺∇⎕←⍵⌷⍺}∘0 {⍺∇⎕←⍵⌷⍺}∘0 take 0 as initial right argument ⎕←⍺⌷⍵ print element at right arg ⍺∇ ⍵⌷⍺ recursive call with the input and new right arg