You may want to play your video directly from your computer. You could also use a standard DVD player, but the resolution will not be very good. We highly recommend using a little digital media player like the ones listed below. They are relatively inexpensive and you can load your video file onto an SD card or USB thumb drive for playback. The HD video quality is excellent. The products are linked below so that you can conveniently purchase on Amazon.
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NEUMI Atom 4K Ultra-HD Digital Media Player for USB Drives and SD Cards – with HDMI and Analog AV, Automatic Playback and Looping Capability
This is the latest version of the media player I use with my setup. It seems to provide the best quality output of any that I have tried, and I’ve tried a lot! This little box will provide HD quality video up to 4K through an HDMI cable to your projector. You will need a USB drive or SD card loaded with your video file which you plug into the box. It comes with a remote control. It supports a wide variety of video file formats. This goes for about $40
HDMI Media Player, AGPtek Black Mini 1080p Full-HD Ultra HDMI Digital Media Player for -MKV/RM- HDD USB Drives and SD Cards
Another less expensive model that should get the job done. About $35