GLX_NV_present_video
https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf
GLX_NV_present_video

	GLX_NUM_VIDEO_SLOTS_NV 0x20F0
	int glXBindVideoDeviceNV (Display* dpy, unsigned int video_slot, unsigned int video_device, const int* attrib_list)
	unsigned int* glXEnumerateVideoDevicesNV (Display* dpy, int screen, int* nelements)