Unhappy [Q] nexus 5 camera problem

hi
i bought nexus 5 yesterday
LGD-820 / 32gb white / 310KPJP / android 4.2.2

when im recording a video there is annoying sound in
play back VIDEO IN GALLARY

its really bad

can somebody help me what should i do ???

its hardware problem ???

cause if it is .. the store change it for me .

plz help ((((
jabbawockeez rocked