Error with URL video for AR

I'm doing an augmented reality app with Unity and Vuforia. I need to insert 30 videos in the app, which would make it very heavy, so I want to put the videos in URL.

But when I play in the scene with everything ready and the URL of the video inserted happens the following error:

Unable to start ObjectTracker. Your hardware may not support it. UnityEngine.Debug:LogError(Object) Vuforia.VuforiaARController:StartAfterInitializationCompleted() Vuforia.VuforiaARController:UpdateState(Boolean, Boolean) Vuforia.DigitalEyewearARController:Update() System.Delegate:DynamicInvoke(Object[]) Vuforia.DelegateHelper:InvokeDelegate(Delegate, Object[]) Vuforia.DelegateHelper:InvokeWithExceptionHandling(Action) Vuforia.VuforiaBehaviour:Update()

What would that be and how can I resolve it?