when I try to run sample project of Wikitude on an android phone it keeps showing "Running without platform assisted tracking support" what does that mean? I am new to AR so I don't have much idea about this.
Wikitude SDK 7.2.0 added support for ARKit and ARCore to be used when running instant tracking. The message you are seeing is meant to inform you that ARKit / ARCore is not running, most likely because the device you are running on doesn't support it.
For more information about this topic, you can check the Wikitude documentation.
If the camera is not running, please try to disable the Multithreaded Rendering option in Unity.
