写一个python程序:电脑相机实时采集视频流，已知采集的视频流的一相机坐标点p(x，y，z)，利用python-opengl渲染一个正方体，并将正方体的中心放在p点。注意将渲染的正方体和摄像头采集的视频流放在一个窗口

以下是一个简单的示例程序，可以实现电脑相机实时采集视频流，用OpenGL渲染一个正方体，并将正方体的中心放在指定的坐标点上。

import cv2
import numpy as np
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *

# 相机坐标点
camera_coord = (0, 0, -5)

# 正方体顶点坐标
vertices = np.array([
    [-1, -1, -1],
    [ 1, -1, -1],
    [ 1,  1, -1],
    [-1,  1, -1],
    [-1, -1,  1],
    [ 1, -1,  1],
    [ 1,  1,  1],
    [-1,  1,  1],
], dtype=np.float32)

# 正方体面的顶点索引
faces = np.array([
    [0, 1, 2, 3],
    [1, 5, 6, 2],
    [5, 4, 7, 6],
    [4, 0, 3, 7],
    [3, 2, 6, 7],
    [0, 4, 5, 1],
], dtype=np.int32)

# 正方体颜色
colors = np.array([
    [1, 0, 0],
    [0, 1, 0],
    [0, 0, 1],
    [1, 1, 0],
    [0, 1, 1],
    [1, 0, 1],
], dtype=np.float32)

def draw_cube():
    glBegin(GL_QUADS)
    for i in range(len(faces)):
        glColor3fv(colors[i])
        for j in faces[i]:
            glVertex3fv(vertices[j])
    glEnd()

def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glEnable(GL_DEPTH_TEST)

    # 绘制视频流
    ret, frame = cap.read()
    if ret:
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()
        glTranslatef(0, 0, -1)
        glRotatef(180, 0, 1, 0)
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, frame.shape[1], frame.shape[0], 0, GL_BGR, GL_UNSIGNED_BYTE, frame)
        glBegin(GL_QUADS)
        glTexCoord2f(0, 0); glVertex3f(-1, -1, 0)
        glTexCoord2f(1, 0); glVertex3f( 1, -1, 0)
        glTexCoord2f(1, 1); glVertex3f( 1,  1, 0)
        glTexCoord2f(0, 1); glVertex3f(-1,  1, 0)
        glEnd()

    # 绘制正方体
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    glTranslatef(*camera_coord)
    draw_cube()

    glutSwapBuffers()

def reshape(width, height):
    glViewport(0, 0, width, height)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(45, width/height, 0.1, 100)
    glMatrixMode(GL_MODELVIEW)

if __name__ == '__main__':
    # 打开相机
    cap = cv2.VideoCapture(0)

    # 初始化OpenGL窗口
    glutInit()
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
    glutInitWindowSize(640, 480)
    glutCreateWindow("Real-time Video with 3D Cube")

    # 绑定回调函数
    glutDisplayFunc(display)
    glutReshapeFunc(reshape)

    # 初始化OpenGL
    glClearColor(0, 0, 0, 0)
    glEnable(GL_TEXTURE_2D)

    # 开始主循环
    glutMainLoop()

    # 释放资源
    cap.release()