This function returns whether the currently loaded video is set to loop (true) or not (false). You can set a video to loop by calling video_enable_loop().
video_is_looping();
if (video_is_looping()) {
obj_player.control_enabled = false;
}
The above code checks if the currently loaded video is looping, and in that case, disables the player's controls, by setting a custom instance variable to false.