There size limit on VirusTotal, some videos are very big. What if cut off part from the video and send part of it. Is it possible? What part of it, where malware can be?
Most file formats (such as videos) aren't going to execute code unless:
- The file is somehow a valid executable and you purposefully execute it
- The application viewing it (e.g. a video player) has a specific vulnerability, and the file contains crafted content to exploit that specific vulnerability
In either case, there is no way to give you an answer without knowing exactly what type of malware. For instance, #2 could be a vulnerability in the video header, or the video data itself, which could be any part of the file.
In general, if you aren't trying to execute a video file and your video player is up to date, you probably don't need to check your video files for malware.