OpenCV Python OpenGL Texture

I find it very unlikely that your camera is providing a 720 pixel wide and
1280 pixel high image as you tell to OpenGL here:

glTexImage2D(GL_TEXTURE_2D,      0,      GL_RGB,      720,1280,    // <---- HERE      0,      GL_RGB,      GL_UNSIGNED_BYTE,      image)

It seems you just mixed up those two parametes, so the data is reinterpreted
as such, resulting in the output you got.