UPDATE: I magically found the field video_thumbnail as an available insert from the 'fields' options available to me when creating my views loop. I am not sure if it was something i did while messing around that enabled it to show up there, or if it was already there before but i missed it because it was below all the other available inserts. But anyway, it is somehow in there (great!). So i used it as follows, but it isn't working (and I also suspect i would need to add an 'if, then, else statement' of sorts to stop it showing both thumbnail and featured image if both exists. For now though, this does NOT Seem to be working yet:
<div id="mycontainer">
<!– wpv-loop-start –>
<wpv-loop>
<div class="box">
[wpv-post-field name="video_thumbnail"]
[wpv-post-featured-image]
<h2>[wpv-post-title]</h2>[wpv-post-excerpt]
</div>
</wpv-loop>
<!– wpv-loop-end –>
</div>