According to the Nikon page for the D3300 the following is true:
•1920 x 1080, 60p (progressive)/50p/30p/25p/24p, high (fine)/normal
•1280 x 720, 60p/50p, high (fine)/normal
•640 x 424, 30p/25p, high (fine)/normal
•
Frame rates of 30p (actual frame rate 29.97 fps) and 60p (actual frame rate 59.94 fps) are available when NTSC is selected for video mode; 25p and 50p are available when PAL is selected for video mode; Actual frame rate when 24p is selected is 23.976 fps
Source:
http
/imaging.nikon.com/lineup/dslr/d3300/spec.htm