Hi there,
Making the video of higher resolution up to HD, sometimes even 4K, is doable and it solely depends on the video quality and compression which the security camera saved the file in. The face recognition is not something that is available to the public, so making the video in higher quality and saving the best shots showing the face is what I can do, then you need to take these photos to your local authorities to ID the person.
I have 13 years in video production and can help you with your video, I can send you a 10-second preview so you see the quality I can produce for you, and if you're happy and satisfied I can do the rest for you upon hiring me.
Kind regards,
Raad K.