Vuforia - 如何在识别图像时播放一个视频

I have an AR application that has 4 image targets, and each image target has a corresponding video that is played on top of it when it is recognized. The problem is that even though the correct animation is displayed whenever the image is recognized, all of the other animations are played as well, even though they are not displayed. Thus, whenever I move from one image target to another, the video is displayed, but it is already halfway through its runtime. I have an AR application that has 4 image targe