I want to know that is that any particular tutorial by which we can convert VR character in third person character , like I want when I play my VR game then my whole body should be visible , so is there any way to do so ?
There are a few tutorials on YouTube all with their own peculiarities.
EG How To Make an IK Setup for VR In Unreal Engine 4 (Full Body Room Scale) - YouTube
In the end you will be best off watching a few and pulling together your own pawn with what matters to you.
For example, I made one that has a good IK solve for the arms and hands and a completely inaccurate but good-looking animation for the legs based on character rotation. Meanwhile the character head is not rendered to the VR display and is constrained in its rotation and locked in its position.
Other Videos to watch
Super-easy VR body with Arm IK and thumbstick locomotion - Unreal Engine 4 Tutorial - YouTube