A push button animation with guizero

guizero_pushbutton_animation.py

# Install
# - sudo pip3 install guizero
# - sudo pip3 install imageio
# - Attached a picamera and a button to pin 17
# - Run it

from guizero import App, Picture, PushButton, Text
from picamera import PiCamera
from picamera.array import PiRGBArray
from gpiozero import Button
import imageio

# called when a picture is taken
def take_picture():
    instructions.value = "processing ..."
    
    camera.capture(camera_output, "rgb")
    
    # append the camera image to the list as a numpy array
    animation.images.append(camera_output.array)
    # write the animated gif to disk
    imageio.mimsave("temp.gif", animation.images)
    
    # truncate the camera output now we have dealt with it
    camera_output.truncate(0)
    
    #display the animation
    animation.image = "temp.gif"
    instructions.value = "now take another"
    animation.show()
    reset_button.show()
    
# called to reset the gui
def reset():
    instructions.value = "push the button to take a image"
    animation.images = []
    animation.hide()
    reset_button.hide()

# create the button    
button = Button(17)
button.when_pressed = take_picture

# create the camera
camera = PiCamera(resolution="640x480")
camera_output = PiRGBArray(camera)

# create the gui
gui = App(title="push button animation", width=640, height=520)
instructions = Text(gui)
animation = Picture(gui)
reset_button = PushButton(gui, command=reset, text="reset")

# reset everything
reset()

# display it
gui.display()

Nice. Can you please suggest, how to use USB Camera instead of Picamera.
i am looking into "https://www.raspberrypi.org/forums/viewtopic.php?t=84388"