Building own home camera

i am planning to buy a raspberry pi and a usb webcam to mount in my house as a security camera. for reasons.

what i want to do is to code my own go program that opens the webcam and records videos and deletes it afther x days. and maybe even use the likes of frame-based motion detection.

i would at least need: - a pi - a large hdd for video storage since ssd is to small - the usb webcam

why a usb webcam? they offer much higher quality then the standard pi camera.

i plan to hang it in front of my front door, and put a small poster above the camera:

the eye of sauron is watching you or something like that just for the memes.

has anyone done this ?