While, this MP4 video format came from T7i is a Full HD format that is highly compressed, and it can't be imported and edited in Sony Vegas Pro easily. So, the H.264 MP4 compression format should be transcoded into a format better suited for editing with Vegas Pro, and MOV is. Along with some help from a suitable third-party software, you can achieve your goal in the simplest way.
Dimo Video Converter Ultimate is the right tool you need. By running it, there is no need to set the codec yourself, the program provides optimized presets for Sony Vegas Pro. With it, you can encode any video like MOV/MP4/MXF/MTS/XAVC from Canon/Sony/Nikon/Panasonic to a fully compatible format without quality loss to seamlessly fit Vegas Pro 13, 12, 11, 10, 9, etc.
In addition, you can also re-encode Canon T7i/800D MP4 to a more "edit" friendly codec for smoothly importing and editing in various non-linear editing systems (NLE), including Sony Movie Studio Platinum, Adobe Premiere Pro, Avid Media Composer, Windows Movie Maker, GoPro Studio, Pinnacle Studio and more. And the bulit-in editor can help you edit MP4 video from T7i by trimming, cropping, adding effects/watermark, etc.
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