Steganography is a method of concealing private or delicate information inside something that emits an impression of being nothing out of regular. Diverse carrier file formats can be used, for example text documents, audio tracks, digital images, and videos. But, due to immense advancement of information over the web, video steganography has turned into a very popular decision for data hiding. In video steganography, secret information is concealed inside a video to keep it safe from gate crashers. There exists variety of techniques for hiding secret information in a video, each having their own qualities and shortcomings. However, the literature absences of sufficient review articles that talk about all techniques. On the basis of embedding method, video steganography techniques are classified into two categories namely, spatial domain and frequency domain techniques. This paper is an attempt to present a comprehensive study of various state-of-the-art video steganography methods in spatial domain developed in the past decade which are very beneficial for video steganography analysts to acquire better outcomes, high proficiency and security. The paper also suggests with recommendations to improve on existing video steganographic techniques.
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