In general Vahan speaks clearly and is animations (emphasis, smiles, ever so slight laughs) are appropriate.
It does appear that there is room for improvement for it to appear better and more interesting and for him to be more comfortable.
One suggestion is that they have him in front of a silent an audience. It may make him more uncomfortable at first but getting feed back via facial expressions and general energy in the room might push him beyond his comfort level. Then when they film he might be more comfortable and appear more at ease.
What this would look like: He might use his hands more and even if the camera didn't actually capture his actual hands the movement would be apparent and help emphasis what he was saying.