I am using exiftool V10.77 downloaded two days ago. So we are both on recent versions.
To prepend the tag names I used the command: exiftool -G0:1 <filename>
Maybe there is a difference between video files recorded by a video camera and a stills camera. I was using a stills camera, Casio EX-FH100, that seems to embed all necessary EXIF tags in the video files. Please see complete exiftool output at the end of the reply.
Video files from other stills cameras (e.g. extensions .mp4) are imported with date/time information although maker/model is missing in "Get info...".

So Photos is capable of dealing with date/time info for video files. I guess they are extracted from EXIF information and not filesystem information. Because when I change "creation and/or modification date" of the video file in the filesystem (using SetFile) before import, the imported file still gets the correct date.
Maybe it is just not working for AVI files. My other camera, a FujiFilm F601 Zoom, is also producing AVI files. BTW all my imported AVI files can be viewed with Photos, like the other video files. So there seems to be no general problem with AVI not treated as video file.
All videos recorded with iPhones/iPads even get the model information correct.
Do your other video files get correct date/time and model information after import? And what extension do those files have?
Thanks for your help and regards
-jay
This is the complete output for the AVI file (exiftool -G0:1 CIMG0746.AVI):
[ExifTool] ExifTool Version Number : 10.77
[File:System] File Name : CIMG0746.AVI
[File:System] Directory : .
[File:System] File Size : 11 MB
[File:System] File Modification Date/Time : 2011:04:09 14:49:46+02:00
[File:System] File Access Date/Time : 2018:02:01 09:34:32+01:00
[File:System] File Inode Change Date/Time : 2018:02:01 09:32:32+01:00
[File:System] File Permissions : rwxrwxrwx
[File] File Type : AVI
[File] File Type Extension : avi
[File] MIME Type : video/x-msvideo
[File] BMP Version : Windows V3
[File] Image Width : 1280
[File] Image Height : 720
[File] Planes : 1
[File] Bit Depth : 24
[File] Compression : MJPG
[File] Image Length : 2764800
[File] Pixels Per Meter X : 0
[File] Pixels Per Meter Y : 0
[File] Num Colors : Use BitDepth
[File] Num Important Colors : All
[RIFF] Frame Rate : 29.97
[RIFF] Max Data Rate : 3705 kB/s
[RIFF] Frame Count : 96
[RIFF] Stream Count : 2
[RIFF] Stream Type : Video
[RIFF] Video Codec : mjpg
[RIFF] Video Frame Rate : 29.97
[RIFF] Video Frame Count : 96
[RIFF] Quality : 10000
[RIFF] Sample Size : Variable
[RIFF] Audio Codec : .
[RIFF] Audio Sample Rate : 21.61
[RIFF] Audio Sample Count : 69
[RIFF] Encoding : Intel IMA/DVI-ADPCM
[RIFF] Num Channels : 2
[RIFF] Sample Rate : 44100
[RIFF] Avg Bytes Per Sec : 44251
[RIFF] Bits Per Sample : 4
[EXIF:IFD0] Make : CASIO COMPUTER CO.,LTD.
[EXIF:IFD0] Camera Model Name : EX-FH100
[EXIF:IFD0] Orientation : Horizontal (normal)
[EXIF:IFD0] X Resolution : 72
[EXIF:IFD0] Y Resolution : 72
[EXIF:IFD0] Resolution Unit : inches
[EXIF:IFD0] Software : 1.00
[EXIF:IFD0] Modify Date : 2011:04:09 14:49:47
[EXIF:IFD0] Y Cb Cr Positioning : Centered
[EXIF:ExifIFD] Exposure Time : 1/100
[EXIF:ExifIFD] F Number : 16.1
[EXIF:ExifIFD] Exposure Program : Program AE
[EXIF:ExifIFD] Date/Time Original : 2011:04:09 14:49:47
[EXIF:ExifIFD] Create Date : 2011:04:09 14:49:47
[EXIF:ExifIFD] Exposure Compensation : 0
[EXIF:ExifIFD] Metering Mode : Multi-segment
[EXIF:ExifIFD] Light Source : Unknown
[EXIF:ExifIFD] Focal Length : 43.0 mm
[EXIF:ExifIFD] Exposure Mode : Auto
[EXIF:ExifIFD] White Balance : Auto
[EXIF:ExifIFD] Digital Zoom Ratio : undef
[EXIF:ExifIFD] Focal Length In 35mm Format : 240 mm
[EXIF:ExifIFD] Gain Control : None
[EXIF:ExifIFD] Contrast : Normal
[EXIF:ExifIFD] Saturation : Normal
[EXIF:ExifIFD] Sharpness : Normal
[MakerNotes:Casio] Firmware Date : 2010:02:26 14:05
[MakerNotes:Casio] Record Mode : Movie
[MakerNotes:Casio] Focus Mode : Single-Area Auto Focus
[MakerNotes:Casio] Best Shot Mode : Expression CS
[MakerNotes:Casio] Auto ISO : On
[MakerNotes:Casio] Color Mode : Off
[MakerNotes:Casio] Enhancement : Off
[MakerNotes:Casio] Color Filter : Off
[MakerNotes:Casio] Art Mode : Normal
[MakerNotes:Casio] Image Stabilization : Best Shot
[MakerNotes:Casio] Lighting Mode : Off
[MakerNotes:Casio] Portrait Refiner : Off
[MakerNotes:Casio] Capture Frame Rate : 30
[MakerNotes:Casio] Video Quality : HD (720p)
[Composite] Aperture : 16.1
[Composite] Duration : 3.20 s
[Composite] Image Size : 1280x720
[Composite] Megapixels : 0.922
[Composite] Scale Factor To 35 mm Equivalent: 5.6
[Composite] Shutter Speed : 1/100
[Composite] Circle Of Confusion : 0.005 mm
[Composite] Field Of View : 8.6 deg
[Composite] Focal Length : 43.0 mm (35 mm equivalent: 240.0 mm)
[Composite] Hyperfocal Distance : 21.33 m