GLX_NV_video_capture
http://www.opengl.org/registry/specs/gl/NV/video_capture.txt
GLX_NV_video_capture
	GLX_DEVICE_ID_NV 0x20CD
	GLX_UNIQUE_ID_NV 0x20CE
	GLX_NUM_VIDEO_CAPTURE_SLOTS_NV 0x20CF
	int glXBindVideoCaptureDeviceNV (Display* dpy, unsigned int video_capture_slot, GLXVideoCaptureDeviceNV device)
	GLXVideoCaptureDeviceNV * glXEnumerateVideoCaptureDevicesNV (Display* dpy, int screen, int *nelements)
	void glXLockVideoCaptureDeviceNV (Display* dpy, GLXVideoCaptureDeviceNV device)
	int glXQueryVideoCaptureDeviceNV (Display* dpy, GLXVideoCaptureDeviceNV device, int attribute, int *value)
	void glXReleaseVideoCaptureDeviceNV (Display* dpy, GLXVideoCaptureDeviceNV device)
    typedef XID GLXVideoCaptureDeviceNV