From the app's splash screen ?? At least on my iPhone version there is.a link to my downloaded clips. BUT:.. these files are in hidden folders and can only be viewed from/by the app.
Check the 'gallery - Videos section' for the videos downloaded or check for a 'folder name' by the camera you own in the file manager.
I own a Viofo A229 Duo and the application creates a folder named 'Viofo' in the gallery where all the pictures and videos are saved whenever I download through the Viofo application.