I'm working on a small video project using Python and MoviePy, and I want to create a color clip with rounded corners to use as a background. However, I'm unsure how to achieve this effect. So far I have a rectangle background !!. Can anyone give me a small example on how to add rounded corners to a color clip in MoviePy?

我正在使用Python和MoviePy进行一个小型视频项目，我想创建一个圆角的彩色剪辑作为背景。然而，我不确定如何达到这种效果。到目前为止，我有一个矩形背景！！。有人能给我一个小例子，告诉我如何在MoviePy中的彩色剪辑中添加圆角吗？

from moviepy.editor import VideoFileClip, TextClip, CompositeVideoClip, ColorClip
# Create a color clip as the background
color_clip = ColorClip(size=(video_clip.size[0], video_clip.size[1]),
                       color=(0, 0, 0), duration=video_clip.duration)

# Set the opacity of the color clip
color_clip = color_clip.set_opacity(0.4)

# Set the position of the color clip and text clip
color_clip = color_clip.set_position('center')