To load a single geotagged video to LineVision go to File > Open Video then navigate to Windows folder where you downloaded the geotagged video AND GPS “companion” or “sidecar” files. This should load up the video and play with the clickable GPS track on the map.
Check out this short tutorial:
General LineVision FAQ,
LineVision Esri ArcMap Add-in,
LineVision Google Earth Extension,