Click on Manage Fields next to the newly created video content type.
Within the section that says New Field, add a new field for your Video upload. Use the following settings.
Field Name: Image Upload
Field Type: File
Form Element: Image
Now press the Save button at the bottom of the page.
Within the field settings, provide the following to the Permitted upload file extensions: png gif jpg jpeg
Open up the File Size Restrictions and make sure that your max upload limit is large enough. If not, then this can be set within the php.ini file for your server if you need larger file uploads.
Now press the Save Field Settings button at the bottom of the page.
Now, within the Manage Fields section, simply drag your field using the cross-hair symbol to where you would like to have your image upload when you create a new video.