A handy list of VideoCapture object parameters taken from official OpenCV docs.

opencv-videocapture-useful-properties.txt

CAP_PROP_POS_MSEC       =0, //!< Current position of the video file in milliseconds.
CAP_PROP_POS_FRAMES     =1, //!< 0-based index of the frame to be decoded/captured next.
CAP_PROP_POS_AVI_RATIO  =2, //!< Relative position of the video file: 0=start of the film, 1=end of the film.
CAP_PROP_FRAME_WIDTH    =3, //!< Width of the frames in the video stream.
CAP_PROP_FRAME_HEIGHT   =4, //!< Height of the frames in the video stream.
CAP_PROP_FPS            =5, //!< Frame rate.
CAP_PROP_FOURCC         =6, //!< 4-character code of codec. see VideoWriter::fourcc .
CAP_PROP_FRAME_COUNT    =7, //!< Number of frames in the video file.
CAP_PROP_FORMAT         =8, //!< Format of the %Mat objects returned by VideoCapture::retrieve().
CAP_PROP_MODE           =9, //!< Backend-specific value indicating the current capture mode.
CAP_PROP_BRIGHTNESS    =10, //!< Brightness of the image (only for those cameras that support).
CAP_PROP_CONTRAST      =11, //!< Contrast of the image (only for cameras).
CAP_PROP_SATURATION    =12, //!< Saturation of the image (only for cameras).
CAP_PROP_HUE           =13, //!< Hue of the image (only for cameras).
CAP_PROP_GAIN          =14, //!< Gain of the image (only for those cameras that support).
CAP_PROP_EXPOSURE      =15, //!< Exposure (only for those cameras that support).
CAP_PROP_CONVERT_RGB   =16, //!< Boolean flags indicating whether images should be converted to RGB.
CAP_PROP_WHITE_BALANCE_BLUE_U =17, //!< Currently unsupported.
CAP_PROP_RECTIFICATION =18, //!< Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently).
CAP_PROP_MONOCHROME    =19,
CAP_PROP_SHARPNESS     =20,
CAP_PROP_AUTO_EXPOSURE =21, //!< DC1394: exposure control done by camera, user can adjust reference level using this feature.
CAP_PROP_GAMMA         =22,
CAP_PROP_TEMPERATURE   =23,
CAP_PROP_TRIGGER       =24,
CAP_PROP_TRIGGER_DELAY =25,
CAP_PROP_WHITE_BALANCE_RED_V =26,
CAP_PROP_ZOOM          =27,
CAP_PROP_FOCUS         =28,
CAP_PROP_GUID          =29,
CAP_PROP_ISO_SPEED     =30,
CAP_PROP_BACKLIGHT     =32,
CAP_PROP_PAN           =33,
CAP_PROP_TILT          =34,
CAP_PROP_ROLL          =35,
CAP_PROP_IRIS          =36,
CAP_PROP_SETTINGS      =37, //!< Pop up video/camera filter dialog (note: only supported by DSHOW backend currently. The property value is ignored)
CAP_PROP_BUFFERSIZE    =38,
CAP_PROP_AUTOFOCUS     =39,
CAP_PROP_SAR_NUM       =40, //!< Sample aspect ratio: num/den (num)
CAP_PROP_SAR_DEN       =41, //!< Sample aspect ratio: num/den (den)